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Pulsar positioning system: a quest for evidence of extraterrestrial engineering

  • Clément Vidal (a1)
Abstract
Abstract

Pulsars have at least two impressive applications. First, they can be used as highly accurate clocks, comparable in stability to atomic clocks; secondly, a small subset of pulsars, millisecond X-ray pulsars, provide all the necessary ingredients for a passive galactic positioning system. This is known in astronautics as X-ray pulsar-based navigation (XNAV). XNAV is comparable to GPS, except that it operates on a galactic scale. I propose a SETI-XNAV research program to test the hypothesis that this pulsar positioning system might be an instance of galactic-scale engineering by extraterrestrial beings. The paper starts by exposing the basics of pulsar navigation, continues with a critique of the rejection of the extraterrestrial hypothesis when pulsars were first discovered. The core section of the paper proposes lines of inquiry for SETI-XNAV, related to the pulsar distribution and power in the galaxy; their population; their evolution; possible pulse synchronizations; pulsar usability when navigating near the speed of light; decoding galactic coordinates; directed panspermia; and information content in pulses. Even if pulsars are natural, they are likely to be used as standards by ETIs in the galaxy. I discuss possible objections and potential benefits for humanity, whether the research program succeeds or not.

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Author for correspondence: Clément Vidal, E-mail: contact@clemvidal.com, http://www.clemvidal.com
References
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Anderson CG (1990) ‘Spinning Pulsar’ claims retracted. Nature 343(6260), 679679. doi: 10.1038/343679b0.
Anver and Vasyl (2014) GPS Accuracy|Lemberg Solutions Blog. January 6. http://blog.lemberg.co.uk/gps-accuracy-complete-guide-dummies.
Armstrong S and Sandberg A (2013) Eternity in six hours: intergalactic spreading of intelligent life and sharpening the Fermi Paradox. Acta Astronautica 89(August), 113. doi: 10.1016/j.actaastro.2013.04.002. http://www.fhi.ox.ac.uk/intergalactic-spreading.pdf.
Arrhenius S (1908) Worlds in the Making: The Evolution of the Universe. Harper & brothers, New York.
Backer DC, Kulkarni SR, Heiles C, Davis MM and Goss WM (1982) A millisecond pulsar. Nature 300(5893), 615618. doi: 10.1038/300615a0.
Barrow JD (1998) Impossibility: The Limits of Science and the Science of Limits. USA: Oxford University Press.
Becker W and Trümper J (1993) Detection of pulsed X-rays from the binary millisecond pulsar J0437-4715. Nature 365(6446), 528530. doi: 10.1038/365528a0.
Becker W, Bernhardt MG and Jessner A (2013) Autonomous spacecraft navigation with pulsars. Acta Futura 7, 1128. doi: 10.2420/AF07.2013.11. http://arxiv.org/abs/1305.4842.
Benford G, James B and Benford D (2010 a) Searching for cost-optimized interstellar beacons. Astrobiology 10(5), 491498. doi: 10.1089/ast.2009.0394. https://arxiv.org/abs/0810.3966.
Benford J (2010) How can we distinguish transient pulsars from SETI beacons? ArXiv:1003.5938. http://arxiv.org/abs/1003.5938.
Benford J and Benford D (2016) Power beaming leakage radiation as a SETI observable. Astrophys. J. 825(2), 101. doi: 10.3847/0004-637X/825/2/101. http://arxiv.org/abs/1602.05485.
Benford J, Benford G and Benford D (2010 b) Messaging with cost-optimized interstellar beacons. Astrobiology 10(5), 475490. doi: 10.1089/ast.2009.0393. https://arxiv.org/abs/0810.3964.
Bennett CH (1988) Logical depth and physical complexity. In Herken R (ed.). The Universal Turing Machine: A Half-Century Survey. Oxford University Press, Oxford. pp. 227257. http://researcher.watson.ibm.com/researcher/files/us-bennetc/UTMX.pdf.
Bhat NDR, Gupta Y, Kramer M, Karastergiou A, Lyne AG and Johnston S (2007) Simultaneous single-pulse observations of radio pulsars – V. On the broadband nature of the pulse nulling phenomenon in PSR B1133 + 16. Astron. Astrophys. 462(1), 257268. doi: 10.1051/0004-6361:20053157.
Bhattacharya D and van den Heuvel EPJ (1991) Formation and evolution of binary and millisecond radio pulsars. Phys. Rep. 203(1), 1124. doi: 10.1016/0370-1573(91)90064-S.
Blandford R and Teukolsky SA (1976) Arrival-time analysis for a pulsar in a binary system. Astrophys. J. 205(April), 580591. doi: 10.1086/154315. http://adsabs.harvard.edu/abs/1976ApJ...205..580B.
Bradbury RJ, Ćirković MM and Dvorsky G (2011) Dysonian approach to SETI: a fruitful middle ground? J. Br. Interplanet. Soc. 64, 156165. https://www.researchgate.net/profile/Milan_Cirkovic/publication/258496083_Dysonian_Approach_to_SETI_A_Fruitful_Middle_Ground/links/53e797750cf2fb748721a3ff.pdf.
Buist PJ, Engelen S, Noroozi A, Sundaramoorthy P, Verhagen S and Verhoeven C (2011) Overview of pulsar navigation: past, present and future trends. Navigation 58, 153164. doi: 10.1002/j.2161-4296.2011.tb01798.x.
Bunandar D, Caveny SA and Matzner RA (2011) Measuring emission coordinates in a pulsar-based relativistic positioning system. Phys. Rev. D 84(10), 104005. doi: 10.1103/PhysRevD.84.104005.
Burderi L, D'Antona F and Burgay M (2002) PSR J1740-5340, accretion inhibited by radio ejection in a binary millisecond pulsar in the globular cluster NGC 6397. Astrophys. J. 574(1), 325. doi: 10.1086/340891. https://arxiv.org/abs/astro-ph/0203387.
Burleigh S, Hooke A, Torgerson L, Fall K, Cerf V, Durst B, Scott K and Weiss H (2003) Delay-tolerant networking: an approach to interplanetary internet. IEEE Commun. Mag. 41(6), 128136. doi: 10.1109/MCOM.2003.1204759. http://symoon.free.fr/scs/dtn/biblio/ieee-comsoc-article.pdf.
Burnell SJB (1977) Little green men, white dwarfs or pulsars? Ann. New York Acad. Sci. 302, 685689.
Camilo F, Thorsett SE and Kulkarni SR (1994) The magnetic fields, ages, and original spin periods of millisecond pulsars. Astrophys. J. 421(January), L15L18. doi: 10.1086/187176. http://adsabs.harvard.edu/abs/1994ApJ...421L..15C.
Carstairs IR (2002) Spreading the net. Astron. Geophys. 43(6), 6.266.29. doi: 10.1046/j.1468-4004.2002.43626.x. https://academic.oup.com/astrogeo/article-lookup/doi/10.1046/j.1468-4004.2002.43626.x.
Chen K, Ruderman M and Zhu T (1998) Millisecond pulsar alignment: PSR J0437-4715. Astrophys. J. 493(1), 397. doi: 10.1086/305106. http://iopscience.iop.org/article/10.1086/305106/meta.
Chennamangalam J, Siemion A, Lorimer DR and Werthimer D (2015) Jumping the energetics queue: modulation of pulsar signals by extraterrestrial civilizations. New Astron. 34, 245249. http://arxiv.org/abs/1311.4608.
Chester TJ and Butman SA (1981) Navigation using X-ray pulsars. NASA Technical Reports N81-27129.
Ćirković M (2008) Against the empire. J. Br. Interplanet. Soc. 61(7), 246254.
Cocconi G and Morrison P (1959) Searching for interstellar communications. Nature 184, 844846. doi: 10.1038/184844a0. http://www.iaragroup.org/_OLD/seti/pdf_IARA/cocconi.pdf.
Cognard I and Backer DC (2004) A microglitch in the millisecond pulsar PSR B1821-24 in M28. Astrophys. J. Lett. 612(2), L125. doi: 10.1086/424692.
Coll B, Ferrando JJ and Morales-Lladosa JA (2010) Positioning systems in Minkowski spacetime: from emission to inertial coordinates. Class. Quantum Grav. 27(6), 065013. doi: 10.1088/0264-9381/27/6/065013. https://arxiv.org/abs/1204.2241.
Corbet RHD (1997) SETI at X-energies – parasitic searches from astrophysical observations. J. Br. Interplanet. Soc. 50(January), 253257. https://arxiv.org/abs/1609.00330.
Cordes JM and Sullivan WT III (1995) Astrophysical coding: a new approach to SETI signals. I. Signal design and wave propagation. Prog. Search Extraterrestrial Life 74, 325334. ASP Conference Series. http://adsabs.harvard.edu/abs/1995ASPC...74..325C.
Crick FHC (1981) Life Itself: Its Origin and Nature. New York: Simon and Schuster.
Crick FHC and Orgel LE (1973) Directed panspermia. Icarus 19(3), 341346. doi: 10.1016/0019-1035(73)90110-3.
Dacke M, Baird E, Byrne M, Scholtz CH and Warrant EJ (2013) Dung beetles use the milky way for orientation. Current Biol. 23(4), R149R150. doi: 10.1016/j.cub.2012.12.034. http://www.cell.com/current-biology/abstract/S0960-9822(12)01507-2.
Davies PCW (2010) The Eerie Silence: Are We Alone in the Universe? London: Penguin Books.
Delahaye J-P and Vidal C (2016) Organized complexity: is big history a big computation? ArXiv:1609.07111 [Cs], September. http://arxiv.org/abs/1609.07111.
Dick SJ (1996) The Biological Universe: The Twentieth Century Extraterrestrial Life Debate and the Limits of Science. Cambridge University Press, Cambridge, U.K.
Dick SJ (2009) Bringing culture to cosmos: the postbiological universe. In Dick SJ and Lupisella ML (eds). Cosmos and Culture: Cultural Evolution in a Cosmic Context. Washington, DC: Government Printing Office, pp. 463487. NASA SP-2009-4802. http://history.nasa.gov/SP-4802.pdf.
Dick SJ (2013) Discovery and Classification in Astronomy: Controversy and Consensus. New York, NY, USA: Cambridge University Press.
Dick SJ (ed.) (2015) The Impact of Discovering Life Beyond Earth. Cambridge: Cambridge University Press.
Di Salvo T, Burderi L, Riggio A, Papitto A, Menna MT and Axelsson M (2008) Order in the chaos? The strange case of accreting millisecond pulsars. AIP Conf. Proc. 1054(1), 173182. doi: 10.1063/1.3002500. http://aip.scitation.org/doi/abs/10.1063/1.3002500.
Dixon RS (1973) A search strategy for finding extraterrestrial radio beacons. Icarus 20(2), 187199. doi: 10.1016/0019-1035(73)90050-X.
Downs GS (1974) Interplanetary navigation using pulsating radio sources. NASA Technical Reports N74-34150. https://ntrs.nasa.gov/search.jsp?R=19740026037.
Dyson FJ (1960) Search for artificial stellar sources of infrared radiation. Science 131(3414), 16671668. doi: 10.1126/science.131.3414.1667.
Dyson FJ (2015) Freeman Dyson – Noah's Ark Eggs and Warm-Blooded Plants – YouTube. https://www.youtube.com/watch?v=_yzgPMwshqE&list=PLbbCsk7MUIGdscYLrtDFM4mpQeRPnrOyO&index=3.
Dyson FJ, Kardashev NS, Ginzburg VL and Marx G (1973) Astroengineering activity: the possibility of ETI in present astrophysical phenomena. In Sagan C (ed.). Communication with Extraterrestrial Intelligence (CETI). Cambridge: MIT Press, pp. 188229.
Edmondson WH (2010) Targets and SETI: shared motivations, life signatures and asymmetric SETI. Acta Astronautica, Special Issue on Searching for Life Signatures 67(11–12), 14101418. doi: 10.1016/j.actaastro.2010.01.017. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.154.2487&rep=rep1&type=pdf.
Edmondson WH and Stevens IR (2003) The utilization of pulsars as SETI beacons. Int. J. Astrobiol. 2(4), 231271. doi: 10.1017/S1473550403001666. http://www.journals.cambridge.org/abstract_S1473550403001666.
Emadzadeh AA and Speyer JL (2011) Navigation in Space by X-Ray Pulsars. Springer, New York.
Erlich Y and Zielinski D (2017) DNA fountain enables a Robust and efficient storage architecture. Science 355(6328), 950954. doi: 10.1126/science.aaj2038. http://biorxiv.org/content/early/2016/12/04/074237.
Espinoza CM, Lyne AG, Stappers BW and Kramer M (2011) A study of 315 glitches in the rotation of 102 pulsars. MNRAS 414(2), 16791704. doi: 10.1111/j.1365-2966.2011.18503.x. https://arxiv.org/abs/1102.1743.
Extance A (2016) How DNA could store all the World's data. Nat. News 537(7618), 22. doi: 10.1038/537022a.
Fabian AC (1977) Signalling over stellar distances with X-rays. J. Br. Interplanet. Soc. 30(March), 112. http://adsabs.harvard.edu/abs/1977JBIS...30..112F.
Faulkner AJ, Stairs IH, Kramer M, Lyne AG, Hobbs G, Possenti A, Lorimer DR, Manchester RN, McLaughlin MA, D'Amico N, Camilo F, Burgay M (2004) The parkes multibeam pulsar survey – V. Finding binary and millisecond pulsars. MNRAS 355(1), 147158. doi: 10.1111/j.1365-2966.2004.08310.x.
Flores Martinez CL (2014) SETI in the light of cosmic convergent evolution. Acta Astronautica 104(1), 341349. doi: 10.1016/j.actaastro.2014.08.013. https://www.researchgate.net/publication/265854623_SETI_in_the_light_of_cosmic_convergent_evolution.
Gdańsk Tourism Organization (2017) Pulsar clock. Accessed January 25. http://visitgdansk.com/en/hity-gdanska/Pulsar-Clock,a,3493.
Gold T (1968) Rotating neutron stars as the origin of the pulsating radio sources. Nature 218, 731732. doi: 10.1038/218731a0.
Graven P, Collins J, Sheikh S and Hanson JE (2007) XNAV beyond the Moon. In Proc. ION 63rd Annual Meeting, pp. 423–431. http://www.asterlabs.com/publications/2007/Graven_et_al,_ION_63_AM_April_2007.pdf.
Guillochon J and Loeb A (2015) SETI via leakage from light sails in exoplanetary systems. Astrophys. J. Lett. 811(2), L20. doi: 10.1088/2041-8205/811/2/L20. http://arxiv.org/abs/1508.03043.
Hanson J, Sheikh S, Graven P and Collins J (2008) Noise analysis for X-ray navigation systems. In 2008 IEEE/ION Position, Location and Navigation Symposium, pp. 704–713. doi: 10.1109/PLANS.2008.4570028.
Hart MH (1975) Explanation for the absence of extraterrestrials on Earth. QJRMS 16, 128. http://articles.adsabs.harvard.edu/full/1975QJRAS..16..128H/0000128.000.html.
Hartnett JG and Luiten AN (2011) Comparison of astrophysical and terrestrial frequency standards. Rev. Modern Phys. 83(1), 19. doi: 10.1103/RevModPhys.83.1. https://arxiv.org/abs/1004.0115.
Heidmann J (1988) Strategies for the search of extraterrestrial radio signals using pulsars. Academie Des Sciences Paris Comptes Rendus Serie B Sciences Physiques 306(May), 14411445. http://adsabs.harvard.edu/abs/1988CRASB.306.1441H.
Heidmann J (1992) Pulsar-aided SETI within a hundred light years. Acta Astronautica 26(2), 129132. doi: 10.1016/0094-5765(92)90054-M.
Heidmann J, Biraud F and Tarter J (1992) Pulsar-aided SETI experimental observations. Acta Astronautica 26(3–4), 205209. doi: 10.1016/0094-5765(92)90097-3.
Hewish A (2008) Interview of Sir Antony Hewish. https://www.repository.cam.ac.uk/handle/1810/197579.
Hobbs G (2012) Spacecraft, clocks and black holes: the Parkes radio telescope. Aust. Q. 83(4), 15.
Hobbs G, Lorimer DR, Lyne AG and Kramer M (2005) A statistical study of 233 pulsar proper motions. MNRAS 360(3), 974992. doi: 10.1111/j.1365-2966.2005.09087.x. http://mnras.oxfordjournals.org/content/360/3/974.
Hobbs G, Coles W, Manchester RN, Keith MJ, Shannon RM, Chen D, Bailes M, Bhat NDR, Burke-Spolaor S, Champion D, Chaudhary A, Hotan A, Khoo J, Kocz J, Levin Y, Oslowski S, Preisig B, Ravi V, Reynolds JE, Sarkissian J, van Straten W, Verbiest JPW, Yardley D, You XP (2012) Development of a pulsar-based time-scale. MNRAS 427(4), 27802787. doi: 10.1111/j.1365-2966.2012.21946.x. http://mnras.oxfordjournals.org/cgi/doi/10.1111/j.1365-2966.2012.21946.x.
Jastrow R and Thompson MH (1977) Astronomy: Fundamentals and Frontiers, 3rd edn. New York: Wiley.
Kaplan DL, Bhalerao VB, van Kerkwijk MH, Koester D, Kulkarni SR and Stovall K. (2013) A metal-rich low-gravity companion to a massive millisecond pulsar. Astrophys. J. 765(2), 158. doi: 10.1088/0004-637X/765/2/158. http://stacks.iop.org/0004-637X/765/i=2/a=158.
Kardashev NS (1964) Transmission of information by extraterrestrial civilizations. Soviet Astron. 8(2), 217220. http://adsabs.harvard.edu/abs/1964SvA.....8..217K.
Kízíltan B and Thorsett SE (2009) Constraints on pulsar evolution: the joint period-spin-down distribution of millisecond pulsars. Astrophys. J. Lett. 693(2), L109. doi: 10.1088/0004-637X/693/2/L109. http://www.arxiv.org/abs/0902.0604.
Kízíltan B and Thorsett SE (2010) Do all millisecond pulsars share a common Heritage? In AIP Conference Proceedings, vol. 1280, pp. 57–64. AIP Publishing. doi: 10.1063/1.3507201. http://arxiv.org/abs/0905.2183.
Kramer M (2004) Millisecond pulsars as tools of fundamental physics. In Karshenboim SG and Peik E (eds). Astrophysics, Clocks and Fundamental Constants. Lecture Notes in Physics 648. Berlin Heidelberg: Springer, pp. 3354. http://arxiv.org/abs/astro-ph/0405178.
Kramer M, Xilouris KM, Lorimer DR, Doroshenko O, Jessner A, Wielebinski R, Wolszczan A and Camilo F (1998) The characteristics of millisecond pulsar emission. I. Spectra, pulse shapes, and the beaming fraction. Astrophys. J. 501(1), 270. doi: 10.1086/305790. http://stacks.iop.org/0004-637X/501/i=1/a=270.
Kristian J, Pennypacker CR, Middledrtch J, Hamuy MA, Imamura JN, Kunkel WE, Lucinio R, Morris DE, Muller RA, Perlmutter S, Rawlings SJ, Sasseen TP, Shelton IK, Steiman-Cameron TY, Tuohy IR (1989) Submillisecond optical pulsar in Supernova 1987A. Nature 338(6212), 234236. doi: 10.1038/338234a0.
Lamb FK, Boutloukos S, Van Wassenhove S, Chamberlain RT, Lo KH, Clare A, Yu W and Miller MC (2009) A model for the waveform behavior of accreting millisecond X-ray pulsars: nearly aligned magnetic fields and moving emission regions. Astrophys. J. 706(1), 417. doi: 10.1088/0004-637X/706/1/417. http://stacks.iop.org/0004-637X/706/i=1/a=417.
Last C (2017) Big historical foundations for deep future speculations: cosmic evolution, atechnogenesis, and technocultural civilization. Found. Sci. 22(1), 39124. doi: 10.1007/s10699-015-9434-y. https://cadelllast.files.wordpress.com/2012/12/last-c-2015-big-historical-foundations-for-deep-future-speculations5.pdf.
LaViolette PA (1999) Evidence that radio pulsars may be artificial beacons of ETI origin. Bull. Am. Astron. Soc. 31, 1461. http://adsabs.harvard.edu/abs/1999AAS...195.5807L.
LaViolette PA (2006) Decoding the Message of the Pulsars: Intelligent Communication from the Galaxy. Bear & Company, Rochester, Vermont.
LaViolette PA (2016) Are radio pulsars extraterrestrial communication beacons? J. Astrobiol. Outreach, March, 1–3. doi: 10.4172/2332-2519.1000148. https://www.esciencecentral.org/journals/are-radio-pulsars-extraterrestrial-communication-beacons-2332-2519-1000148.php?aid=69628.
Lineweaver CH (2001) An estimate of the age distribution of terrestrial planets in the universe: quantifying metallicity as a selection effect. Icarus 151(2), 307313. doi: 10.1006/icar.2001.6607. http://arxiv.org/abs/astro-ph/0012399.
Lineweaver CH, Fenner Y and Gibson BK (2004) The galactic habitable zone and the age distribution of complex life in the milky way. Science 303(5654), 5962. doi: 10.1126/science.1092322. http://arxiv.org/abs/astro-ph/0401024.
Liu J, Ma J, Tian J-W, Kang Z-W and White P (2010) X-ray pulsar navigation method for spacecraft with pulsar direction error. Adv. Space Res. 46(11), 14091417. doi: 10.1016/j.asr.2010.08.019.
Liu K, Bassa CG, Janssen GH, Karuppusamy R, McKee J, Kramer M, Lee KJ, Perrodin D, Purver M, Sanidas S, Smits R, Stappers BW, Weltevrede P, Zhu WW (2016) Variability, polarimetry, and timing properties of single pulses from PSR J1713 + 0747 using the large european array for pulsars. MNRAS 463(3), 32393248. doi: 10.1093/mnras/stw2223. https://arxiv.org/abs/1609.00188.
Loeb A (2014) The habitable epoch of the early universe. Int. J. Astrobiol. 13(04), 337339. doi: 10.1017/S1473550414000196. http://arxiv.org/abs/1312.0613.
Lorimer DR (2008) Binary and millisecond pulsars. Living Rev. Relativ. 11(8), 21. http://www.livingreviews.org/lrr-2008-8.
Lorimer DR and Kramer M (2005) Handbook of Pulsar Astronomy. Cambridge University Press, Cambridge, UK.
Lynch RS, Freire PCC, Ransom SM and Jacoby BA (2012) The timing of nine globular cluster pulsars. Astrophys. J. 745(2), 109. doi: 10.1088/0004-637X/745/2/109. https://arxiv.org/abs/1112.2612.
Lyne AG and Graham-Smith F (2012) Pulsar Astronomy, 4th edn. Cambridge Astrophysics Series. Cambridge; New York: Cambridge University Press.
Lyne AG and Manchester RN (1988) The shape of pulsar radio beams. MNRAS 234(3), 477508. doi: 10.1093/mnras/234.3.477. https://academic.oup.com/mnras/article/234/3/477/1002738/The-shape-of-pulsar-radio-beams.
Lyne AG, Manchester RN, Lorimer DR, Bailes M, D'Amico N, Tauris TM, Johnston S, Bell JF and Nicastro L (1998) The parkes southern pulsar survey – II. Final results and population analysis. MNRAS 295(April), 743755. doi: 10.1046/j.1365-8711.1998.01144.x. http://adsabs.harvard.edu/abs/1998MNRAS.295..743L.
Manchester RN (2009) Radio emission properties of pulsars. In Becker W (ed.). Neutron Stars and Pulsars, vol. 357. Astrophysics and Space Science Library. Berlin Heidelberg: Springer, pp. 1939.
Mautner M (1995) Directed panspermia. 2. Technological advances toward seeding other solar systems and the foundation of Panbiotic Ethics. J. Br. Interplanet. Soc. 48(10), 435440.
Mautner M (2004) Seeding the Universe with Life: Securing Our Cosmological Future, Galactic Ecology, Astroethics and Directed Panspermia. Christchurch, NZ: Legacy Books.
Mautner M (2009) Life-centered ethics, and the human future in space. Bioethics 23(8), 433440. doi: 10.1111/j.1467-8519.2008.00688.x. http://onlinelibrary.wiley.com/doi/10.1111/j.1467-8519.2008.00688.x/abstract.
McKee JW, Janssen GH, Stappers BW, Lyne AG, Caballero RN, Lentati L, Desvignes G, Jessner A, Jordan CA, Karuppusamy R, Kramer M, Cognard I, Champion DJ, Graikou E, Lazarus P, Osłowski S, Perrodin D, Shaifullah G, Tiburzi C, Verbiest JPW (2016) A glitch in the millisecond pulsar J0613-0200. MNRAS 461(3), 28092817. doi: 10.1093/mnras/stw1442. https://arxiv.org/abs/1606.04098.
McNamara G (2008) Clocks in the Sky: The Story of Pulsars. Springer-Praxis Books in Popular Astronomy. Berlin: Springer.
Messerschmitt DG (2012) Interstellar communication: the case for spread spectrum. Acta Astronautica 81(1), 227238. doi: 10.1016/j.actaastro.2012.07.024. https://arxiv.org/abs/1111.0547.
Miller JG (1978) Living Systems. New York: McGraw-Hill.
Miller JL (1990) The timer. Behav. Sci. 35(3), 164196. doi: 10.1002/bs.3830350302.
Mumford L (1934) Technics and Civilization. New York: Harcourt, Brace and Company.
Nakamura H (1986) SV40 DNA – a message from ϵ eri? Acta Astronautica 13(9), 573578. doi: 10.1016/0094-5765(86)90059-7.
Newman WI and Sagan C (1981) Galactic civilizations: population dynamics and interstellar diffusion. Icarus 46(3), 293327. doi: 10.1016/0019-1035(81)90135-4.
Oliver BM and Billingham J (1971) Project cyclops: a design study of a system for detecting extraterrestrial intelligent life. http://adsabs.harvard.edu/abs/1971asee.nasa.....O.
Osłowski S, van Straten W, Bailes M, Jameson A and Hobbs G (2014) Timing, polarimetry and physics of the bright, nearby millisecond pulsar PSR J0437-4715 – a single-pulse perspective. MNRAS 441(4), 31483160. doi: 10.1093/mnras/stu804. https://arxiv.org/abs/1405.2638.
Pacini F (1967) Energy emission from a neutron star. Nature 216(5115), 567568. doi: 10.1038/216567a0.
Penny AJ (2013) The SETI episode in the 1967 discovery of pulsars. Euro. Phys. J. H, 113. doi: 10.1140/epjh/e2012-30052-6. http://arxiv.org/abs/1302.0641.
Popper KR (1959) The Logic of Scientific Discovery. Routledge, London & New York. https://archive.org/details/PopperLogicScientificDiscovery.
Popper KR (1962) Conjectures and Refutations: The Growth of Scientific Knowledge. New York: Basic Books.
Rankin JM and Wright GAE (2003) Circulating subbeam systemsand the physics of pulsar emission. Astron. Astrophys. Rev. 12(1), 4369. doi: 10.1007/s00159-003-0020-x. https://arxiv.org/abs/astro-ph/0306054.
Rawley L, Stinebring D, Taylor J, Davis M and Allan DW (1986) Millisecond Pulsar Rivals Best Atomic Clock Stability. In Proceedings of the Eighteenth Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting, PP. 453–66. Washington D.C.: Princeton University, NJ. http://www.dtic.mil/docs/citations/ADA497948.
Roberts MSE (2012) Surrounded by spiders! New black widows and redbacks in the galactic field. Proc. Int. Astron. Union 8(S291), 127132. doi: 10.1017/S174392131202337X. http://www.journals.cambridge.org/abstract_S174392131202337X.
Rubtsov V (1991) Criteria of artificiality in SETI. In Heidmann J and Klein M (eds). Bioastronomy The Search for Extraterrestial Life — The Exploration Broadens, vol. 390. Lecture Notes in Physics. Berlin/Heidelberg: Springer, pp. 306310.
Sagan C (1973) The Cosmic Connection; an Extraterrestrial Perspective, 1st edn. Garden City, NY: Anchor Press.
Sagan C (1979) Broca's Brain: Reflections on the Romance of Science. New York: Ballantine Books.
Sagan C, Sagan LS and Drake F (1972) A message from Earth. Science 175(4024), 881884. doi: 10.1126/science.175.4024.881.
Sala J, Urruela A, Villares X, Estalella R and Paredes JM (2004) Feasibility study for a spacecraft navigation system relying on pulsar timing information. ARIADNA Study 3(4202.2003), 6. http://www.esa.int/gsp/ACT/doc/ARI/ARI%20Study%20Report/ACT-RPT-MAD-ARI-03-4202-Pulsar%20Navigation-UPC.pdf.
Salthe SN (2002) The natural philosophy of entropy. Seed 2(3). http://see.library.utoronto.ca/SEED/Vol2-3/2-3%20resolved/Salthe.htm.
Schick T Jr. (2002) Do extraordinary claims require extraordinary evidence? In Shermer M (ed.). The Skeptic Encyclopedia of Pseudoscience. Santa Barbara, Calif: ABC-CLIO, pp. 327333.
shCherbak VI and Makukov MA (2013) The ‘Wow! signal’ of the terrestrial genetic code. Icarus 224(1), 228242. doi: 10.1016/j.icarus.2013.02.017. https://arxiv.org/abs/1303.6739.
Sheikh SI (2005) The use of variable celestial X-ray sources for spacecraft navigation. http://drum.lib.umd.edu/handle/1903/2856.
Sheikh SI, Pines DJ, Ray PS, Wood KS, Lovellette MN and Wolff MT (2006) Spacecraft navigation using X-ray pulsars. . Guid. Control Dyn. 29(1), 4963. doi: 10.2514/1.13331. http://www.asterlabs.com/publications/2006/Sheikh_et_al,_AIAA_JGCD_Jan_Feb_2006.pdf.
Sheikh SI, Golshan AR and Pines DJ (2007) Absolute and relative position determination using variable celestial X-ray sources. Adv. Astronautical Sci. 128(7–10), 855. http://www.asterlabs.com/publications/2007/Sheikh_Golshan_&_Pines,_AAS_GCC_February_2007.pdf.
Shklovsky IS (1970) Possible causes of the secular increase in pulsar periods. Soviet Astron. 13, 562. http://adsabs.harvard.edu/abs/1970SvA....13..562S.
Shostak S (1995) SETI at wider bandwidths? 74, 447. http://adsabs.harvard.edu/abs/1995ASPC...74..447S.
Shostak S (1999) In touch at last. Science 286(5446), 18721874. doi: 10.1126/science.286.5446.1872.
Siemion APV, Benford J, Cheng-Jin J, Chennamangalam J, Cordes J, DeBoer DR, Falcke H, Garrett M, Garrington S, Gurvits L, Hoare M, Korpela EJ, Lazio J, Messerschmitt D, Morrison IS, O'Brien T, Paragi Z, Penny A, Spitler L, Tarter J, Werthimer D (2015) Searching for Extraterrestrial Intelligence with the Square Kilometre Array. In Advancing Astrophysics with the Square Kilometre Array (AASKA14). https://arxiv.org/abs/1412.4867.
Siemion A, Von Korff J, McMahon P, Korpela E, Werthimer D, Anderson D, Bower G, Cobb J, Foster G, Lebofsky M, van Leeuwen J., Wagner M. (2010) New SETI sky surveys for radio pulses. Acta Astronautica 67(11–12), 13421349. doi: 10.1016/j.actaastro.2010.01.016. https://arxiv.org/abs/0811.3046.
Smart JM (2009) Evo devo universe? A framework for speculations on cosmic culture. In Dick SJ and Lupisella ML (eds.). Cosmos and Culture: Cultural Evolution in a Cosmic Context. Washington, DC: Government Printing Office, pp. 201295. NASA SP-2009-4802. http://accelerating.org/downloads/SmartEvoDevoUniv2008.pdf.
Smart JM (2012) The transcension hypothesis: sufficiently advanced civilizations invariably leave our universe, and implications for METI and SETI. Acta Astronautica 78(September), 5568. doi: 10.1016/j.actaastro.2011.11.006. http://accelerating.org/articles/transcensionhypothesis.html.
Smith GO (1957) Troubled Star. New York: Avalon Books.
Spaceflight101 (2017) Chinese long March 11 launches first pulsar navigation satellite into Orbit – Spaceflight101. Accessed January 9. http://spaceflight101.com/long-march-11-launches-xpnav-1-satellite/.
Spilker JJ and Parkinson BW (1996) Overview of GPS operation and design. In Parkinson BW and Spilker JJ (eds). Global Positioning System: Theory & Applications, 1st edn. Washington, DC: Amer Inst of Aeronautics.
Sullivan WT III (1991) Pan-galactic pulse periods and the pulse window for SETI. In Heidmann J and Klein MJ (eds). Bioastronomy The Search for Extraterrestial Life — The Exploration Broadens. Lecture Notes in Physics 390. Berlin Heidelberg: Springer, pp. 259268. doi: 10.1007/3-540-54752-5_226.
Sullivan WT III and Cordes JM (1995) Astrophysical coding: a new approach to SETI signals. II. Information about the sender's environment. In Progress in the Search for Extraterrestrial Life, Vol. 74, pp. 337–342. ASP Conference Series. http://adsabs.harvard.edu/abs/1995ASPC...74..337S.
Swift DW (ed.) (1990) Drake FD (Interview). In SETI Pioneers: Scientists Talk about their Search for Extraterrestrial Intelligence. Tucson: University of Arizona Press, pp. 5485.
Tanenbaum AS and van Steen M (2007) Distributed Systems: Principles and Paradigms, 2nd edn. Upper Saddle RIiver, NJ: Pearson Prentice Hall.
Tartaglia A (2010) Emission coordinates for the navigation in space. Acta Astronautica 67(5–6), 539545. doi: 10.1016/j.actaastro.2010.04.007.
Tarter DE (1992) Interpreting and reporting on a SETI discovery: we should be prepared. Space Policy 8(2), 137148. doi: 10.1016/0265-9646(92)90037-V.
Torrieri D (2011) Principles of Spread-Spectrum Communication Systems, 2nd edn. Springer, New York.
Verbiest JPW, Bailes M, Coles WA, Hobbs GB, Straten WVan, Champion DJ, Jenet FA, Manchester RN, Bhat NDR, Sarkissian JM, Yardley D, Burke-Spolaor S, Hotan AW, You XP (2009) Timing stability of millisecond pulsars and prospects for gravitational-wave detection. MNRAS 400(2), 951968. doi: 10.1111/j.1365-2966.2009.15508.x. https://arxiv.org/abs/0908.0244.
Vidal C (2014) The Beginning and the End: The Meaning of Life in a Cosmological Perspective. New York: Springer. http://arxiv.org/abs/1301.1648.
Vidal C (2015) A multidimensional impact model for the discovery of extraterrestrial life. In Dick SJ (ed.) The Impact of Discovering Life Beyond Earth. Cambridge: Cambridge University Press, pp. 5575. doi: 10.1017/CBO9781316272480.006. http://tinyurl.com/vidal2015b.
Vidal C (2016a) Stellivore extraterrestrials? Binary stars as living systems. Acta Astronautica 128, 251256. doi: 10.1016/j.actaastro.2016.06.038. https://zenodo.org/record/164853.
Vidal C (2016b) Panspermia: A Panoply of Possibilities. From Star and Planet Formation to Early Life, COST Action Origins and Evolution of Life in the Universe and the Nordic Network of Astrobiology, 25–28 April 2016, Vilnius, Lithuania. Vilnius, Lithuania. https://www.youtube.com/watch?v=GD0Hi6kbUhI.
Vidal C (2017) Pulsar positioning system: a quest for evidence of extraterrestrial engineering. Working Paper. https://arxiv.org/abs/1704.03316v1.
Voros J (2014) Galactic-scale macro-engineering: looking for signs of other intelligent species, as an exercise in hope for our own. In Grinin LE, Baker D, Quaedackers E and Korotayev A (eds). Teaching and Researching Big History: Exploring A New Scholarly Field. Volgograd, Russia: Uchitel Publishing House, pp. 283304. http://arxiv.org/abs/1412.4011/.
Wade N (1975) Discovery of pulsars: a graduate student's story. Science 189(4200), 358364. doi: 10.1126/science.189.4200.358.
Wang J, Yang J-Y, Fazal IM, Ahmed N, Yan Y, Huang H, Ren Y, Yue Y, Dolinar S, Tur M & Willner AE (2012) Terabit free-space data transmission employing orbital angular momentum multiplexing. Nat. Photonics 6(7), 488496. doi: 10.1038/nphoton.2012.138.
Webb S (2015) If the Universe is Teeming with Aliens … Where Is Everybody? Science and Fiction. Cham: Springer International Publishing.
Wikipedia Contributors (2017) List of microorganisms tested in outer space. Wikipedia. https://en.wikipedia.org/w/index.php?title=List_of_microorganisms_tested_in_outer_space&oldid=762932334.
Winternitz L, Mitchell JW, Hassouneh MA, Valdez JE, Price SR, Semper SR, Yu WH, Ray PS, Wood KS, Arzoumanian Z, Gendreau KC (2016) SEXTANT X-Ray Pulsar Navigation Demonstration: Flight System and Test Results. March 10. https://ntrs.nasa.gov/search.jsp?R=20160003320.
Wolfram S (2002) A New Kind of Science. Champaign, IL: Wolfram Media Inc.
Wright JT, Mullan B, Sigurdsson S and Povich MS (2014) The Ĝ infrared search for extraterrestrial civilizations with large energy supplies. I. Background and justification. Astrophys. J. 792(1), 26. https://arxiv.org/abs/1408.1133.
Wright JT, Cartier KMS, Zhao M, Jontof-Hutter D and Ford EB (2016) The Ĝ search for extraterrestrial civilizations with large energy supplies. IV. The signatures and information content of transiting megastructures. Astrophys. J. 816(1), 17. doi: 10.3847/0004-637X/816/1/17. http://stacks.iop.org/0004-637X/816/i=1/a=17.
Xu Y, Newberg HJ, Carlin JL, Liu C, Deng L, Li J, Schönrich R and Yanny B (2015) Rings and radial waves in the disk of the milky way. Astrophys. J. 801(2), 105. doi: 10.1088/0004-637X/801/2/105. http://arxiv.org/abs/1503.00257.
Yokoo H and Oshima T (1979) Is bacteriophage ΦX174 DNA a message from an extraterrestrial intelligence? Icarus 38(1), 148153. doi: 10.1016/0019-1035(79)90094-0.
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International Journal of Astrobiology
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