Solar System (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Solar System" in Simple English language version.

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54nasa.gov

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33doi.org

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15worldcat.org

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11harvard.edu

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8springer.com

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7nih.gov

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6britannica.com

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6web.archive.org

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5skyatnightmagazine.com

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4arxiv.org

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4scientificamerican.com

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4libretexts.org

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3elsevier.com

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2planetary.org

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2usra.edu

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2sciencedirect.com

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2aanda.org

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2nature.com

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2eos.org

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2astronomy.com

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2archive.org

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1semanticscholar.org

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1australianenvironmentaleducation.com.au

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1gsu.edu

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1caltech.edu

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1oregonstate.edu

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1bgs.ac.uk

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1cambridge.org

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1cfa-harvard.edu

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1geologyglasgow.org.uk

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1space.com

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1universetoday.com

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1berkeley.edu

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1handle.net

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1aps.org

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1solartoscale.com

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1earthsky.org

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1bbc.co.uk

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1swedensolarsystem.se

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1kuriren.nu

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1illinois.edu

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1dlr.de

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1nationalacademies.org

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1uoregon.edu

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1iau.org

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aanda.org (Global: 5,591^st place; Simple English: 1,077^th place)

Dencs, Z.; Regály, Zs (2021-01-01). "Oligarchic growth in a fully interacting system". Astronomy & Astrophysics. 645: A65. arXiv:2012.07683. doi:10.1051/0004-6361/202039567. ISSN 0004-6361.
"Orbital resonance". www.aanda.org. Retrieved 2025-07-05.

aip.org (Global: 2,204^th place; Simple English: 2,559^th place)

pubs.aip.org

Jaki, Stanley L. (1972-07-01). "The Early History of the Titius-Bode Law". American Journal of Physics. 40 (7): 1014–1023. doi:10.1119/1.1986734. ISSN 0002-9505.

aps.org (Global: 1,503^rd place; Simple English: 615^th place)

link.aps.org

Dyson, Freeman J. (1979-07-01). "Time without end: Physics and biology in an open universe". Reviews of Modern Physics. 51 (3): 447–460. doi:10.1103/RevModPhys.51.447. ISSN 0034-6861.

archive.org (Global: 6^th place; Simple English: 4^th place)

Spohn, Tilman; Breuer, Doris; Johnson, T. V., eds. (2014). Encyclopedia of the solar system (3rd ed.). Amsterdam ; Boston: Elsevier. ISBN 978-0-12-415845-0.
Chambers, John; Mitton, Jacqueline (2014). From dust to life : the origin and evolution of our solar system. Princeton, New Jersey: Princeton University Press. ISBN 978-0-691-14522-8. OCLC 859181634.

arxiv.org (Global: 69^th place; Simple English: 49^th place)

Dencs, Z.; Regály, Zs (2021-01-01). "Oligarchic growth in a fully interacting system". Astronomy & Astrophysics. 645: A65. arXiv:2012.07683. doi:10.1051/0004-6361/202039567. ISSN 0004-6361.
Peixinho, Nuno; Thirouin, Audrey; Tegler, Stephen C.; Di Sisto, Romina P.; Delsanti, Audrey; Guilbert-Lepoutre, Aurélie; Bauer, James G. (2020-01-01), Prialnik, Dina; Barucci, M. Antonietta; Young, Leslie A. (eds.), "Chapter 14 - From Centaurs to comets: 40 Years", The Trans-Neptunian Solar System, Elsevier, pp. 307–329, arXiv:1905.08892, doi:10.1016/b978-0-12-816490-7.00014-x, ISBN 978-0-12-816490-7, retrieved 2025-07-05
Pitjeva, E. V.; Pitjev, N. P. (2018). "Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft". Astronomy Letters. 44 (8–9): 554–566. arXiv:1811.05191. doi:10.1134/S1063773718090050. ISSN 1063-7737.
Pitjeva, E. V.; Pitjev, N. P. (2018). "Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft". Astronomy Letters. 44 (8–9): 554–566. arXiv:1811.05191. doi:10.1134/S1063773718090050. ISSN 1063-7737.

astro4dev.org (Global: low place; Simple English: low place)

wpadmin (2018-11-26). "7 Ancient Cultures and How They Shaped Astronomy". IAU Office of Astronomy for Development. Retrieved 2025-07-03.

astronomy.com (Global: low place; Simple English: 3,602^nd place)

Metcalfe, Tom (2021-10-07). "Our solar system's centaurs are half-asteroid, half-comet". Astronomy Magazine. Retrieved 2025-07-05.
Staff, Astronomy (2006-10-01). "Is it a coincidence that most of the planets fall within the Titius-Bode law's boundaries? | Astronomy.com". Astronomy Magazine. Retrieved 2025-07-08.

australianenvironmentaleducation.com.au (Global: low place; Simple English: low place)

"The Solar System: our celestial neighbourhood". Australian Environmental Education. Retrieved 2025-07-03.

bbc.co.uk (Global: 8^th place; Simple English: 7^th place)

"Challenges of space travel - Space exploration - National 5 Physics Revision". BBC Bitesize. Retrieved 2025-07-09.

berkeley.edu (Global: 580^th place; Simple English: 549^th place)

evolution.berkeley.edu

"tidal heating". evolution.berkeley.edu. Retrieved 2025-07-05.

bgs.ac.uk (Global: 6,375^th place; Simple English: 7,659^th place)

"How volcanoes form". British Geological Survey. Retrieved 2025-07-04.

britannica.com (Global: 40^th place; Simple English: 12^th place)

"Heliocentrism | Definition, History, & Facts | Britannica". www.britannica.com. Retrieved 2025-07-03.
"Newton's law of gravitation | Definition, Formula, & Facts | Britannica". www.britannica.com. 2025-06-20. Retrieved 2025-07-03.
"Solar nebula | Formation, Accretion, Protoplanetary Disk | Britannica". www.britannica.com. 2025-06-19. Retrieved 2025-07-04.
"Space exploration - Solar System, Probes, Missions | Britannica". www.britannica.com. 2025-06-18. Retrieved 2025-07-05.
"Small body | Asteroids, Comets & Meteors | Britannica". www.britannica.com. Retrieved 2025-07-07.
"Astronomical unit (AU, or au) | Definition, Conversion, & Facts | Britannica". www.britannica.com. 2025-05-29. Retrieved 2025-07-08.

caltech.edu (Global: 887^th place; Simple English: 618^th place)

ned.ipac.caltech.edu

"Origin of the Chemical Elements - T. Rauscher & A. Patkos". ned.ipac.caltech.edu. Retrieved 2025-07-04.

cambridge.org (Global: 305^th place; Simple English: 225^th place)

Hubickyj, Olenka (2008), Valenti, Jeff; Sahu, Kailash; Livio, Mario (eds.), "Core accretion—gas capture model for gas giant planet formation", A Decade of Extrasolar Planets around Normal Stars: Proceedings of the Space Telescope Science Institute Symposium, held in Baltimore, Maryland May 2–5, 2005, Space Telescope Science Institute Symposium Series, Cambridge: Cambridge University Press, pp. 138–152, ISBN 978-0-521-89784-6, retrieved 2025-07-04

cfa-harvard.edu (Global: low place; Simple English: low place)

Heng Hao (24 November 2004). "Disc-Protoplanet interactions" (PDF). Harvard University. Archived from the original (PDF) on 7 September 2006. Retrieved 2006-11-19.

colorado.edu (Global: 2,526^th place; Simple English: 1,241^st place)

lasp.colorado.edu

"The Outer Planets: How Planets Form". lasp.colorado.edu. Retrieved 2025-07-04.

columbia.edu (Global: 488^th place; Simple English: 126^th place)

"Origin of the Universe and the Earth". www.columbia.edu. Retrieved 2025-07-04.

dlr.de (Global: 9,342^nd place; Simple English: low place)

"Jupiter". www.dlr.de. Retrieved 2025-07-15.

doi.org (Global: 2^nd place; Simple English: 3^rd place)

Connelly, James N.; et al. (2012). "The absolute chronology and thermal processing of solids in the Solar protoplanetary disk". Science. 338 (6107): 651–655. Bibcode:2012Sci...338..651C. doi:10.1126/science.1226919. ISSN 0036-8075. PMID 23118187. S2CID 21965292.
Gillessen, S.; Plewa, P. M.; Eisenhauer, F.; Sari, R.; Waisberg, I.; Habibi, M.; Pfuhl, O.; George, E.; Dexter, J.; Fellenberg, S. von; Ott, T. (2017-03-01). "An Update on Monitoring Stellar Orbits in the Galactic Center". The Astrophysical Journal. 837 (1): 30. doi:10.3847/1538-4357/aa5c41. ISSN 0004-637X.
Bouvier, Audrey; Wadhwa, Meenakshi (2010), "The age of the Solar System redefined by the oldest Pb–Pb age of a meteoritic inclusion.", Nature Geoscience, 3 (9): 637–641, Bibcode:2010NatGe...3..637B, doi:10.1038/ngeo941
Date based on oldest inclusions found to date in meteorites, thought to be among the first solid material to form in the collapsing solar nebula.
Irvine, William M. (1991), Greenberg, J. M.; Pirronello, V. (eds.), "The Molecular Composition of Dense Interstellar Clouds", Chemistry in Space, Dordrecht: Springer Netherlands, pp. 89–121, doi:10.1007/978-94-009-0695-2_4, ISBN 978-94-009-0695-2, retrieved 2025-07-04
Schramm, David N.; Clayton, Robert N. (1978). "Did a Supernova Trigger the Formation of the Solar System?". Scientific American. 239 (4): 124–139. doi:10.1038/scientificamerican1078-124. ISSN 0036-8733. JSTOR 24955827.
Messel, H., ed. (1966-01-01), "chapter 47 - BEGINNINGS – SOLAR SYSTEM, SUN, UNIVERSE……LIFE?", Abridged Science for High School Students, Pergamon, pp. 47–1, doi:10.1016/b978-0-08-012153-6.50034-9, ISBN 978-0-08-012153-6, retrieved 2025-07-04
Ercolano, Barbara; Picogna, Giovanni (2022-12-19). "Modelling photoevaporation in planet forming discs". The European Physical Journal Plus. 137 (12): 1357. doi:10.1140/epjp/s13360-022-03515-8. ISSN 2190-5444.
Kaula, William M. (1986), Sturrock, Peter A.; Holzer, Thomas E.; Mihalas, Dimitri M.; Ulrich, Roger K. (eds.), "Formation of the Sun and its Planets", Physics of the Sun: Volume III: Astrophysics and Solar-Terrestrial Relations, Dordrecht: Springer Netherlands, pp. 1–32, doi:10.1007/978-94-009-5255-3_1, ISBN 978-94-009-5255-3, retrieved 2025-07-04
Raymond, Sean (2011), "Runaway Growth", Encyclopedia of Astrobiology, Springer, Berlin, Heidelberg, pp. 1485–1486, doi:10.1007/978-3-642-11274-4_1397, ISBN 978-3-642-11274-4, retrieved 2025-07-04
Dencs, Z.; Regály, Zs (2021-01-01). "Oligarchic growth in a fully interacting system". Astronomy & Astrophysics. 645: A65. arXiv:2012.07683. doi:10.1051/0004-6361/202039567. ISSN 0004-6361.
Williams, I. P. (1974), Woszczyk, A.; Iwaniszewska, C. (eds.), "Planetary Formation", Exploration of the Planetary System, Dordrecht: Springer Netherlands, pp. 3–12, doi:10.1007/978-94-010-2206-4_1, ISBN 978-94-010-2206-4, retrieved 2025-07-04
Genda, Hidenori (2018), "Giant Impact Hypothesis", Encyclopedia of Geochemistry, Encyclopedia of Earth Sciences Series, Springer, Cham, pp. 617–620, doi:10.1007/978-3-319-39312-4_338, ISBN 978-3-319-39312-4, retrieved 2025-07-04
Sohl, Frank; Breuer, Doris (2014), "Differentiation, Planetary", Encyclopedia of Astrobiology, Springer, Berlin, Heidelberg, pp. 1–5, doi:10.1007/978-3-642-27833-4_430-2, ISBN 978-3-642-27833-4, retrieved 2025-07-04
Owen, James E.; Ercolano, Barbara; Clarke, Cathie J. (2011-03-21). "Protoplanetary disc evolution and dispersal: the implications of X-ray photoevaporation: Disc evolution and dispersal". Monthly Notices of the Royal Astronomical Society. 412 (1): 13–25. doi:10.1111/j.1365-2966.2010.17818.x.
C. Lin, Douglas N. (2008). "The Genesis of Planets". Scientific American. 298 (5): 50–59. doi:10.1038/scientificamerican0508-50 (inactive 12 July 2025). ISSN 0036-8733. PMID 18444325.{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)^{[permanent dead link]}
Claeys, Philippe; Morbidelli, Alessandro (2015), "Late Heavy Bombardment", Encyclopedia of Astrobiology, Springer, Berlin, Heidelberg, pp. 1365–1369, doi:10.1007/978-3-662-44185-5_869, ISBN 978-3-662-44185-5, retrieved 2025-07-05
Gomes, R.; Levison, H. F.; Tsiganis, K.; Morbidelli, A. (2005). "Origin of the cataclysmic Late Heavy Bombardment period of the terrestrial planets". Nature. 435 (7041): 466–469. doi:10.1038/nature03676. ISSN 1476-4687. PMID 15917802.
Malhotra, Renu (2019-11-09). "Resonant Kuiper belt objects: a review". Geoscience Letters. 6 (1) 12. doi:10.1186/s40562-019-0142-2. ISSN 2196-4092. PMC 7067275. PMID 32215241.
Rimrott, Fred P. J. (1989), Rimrott, Fred P. J. (ed.), "Secular Variations of the Orbital Elements", Introductory Orbit Dynamics, Wiesbaden: Vieweg+Teubner Verlag, pp. 101–106, doi:10.1007/978-3-322-90338-9_7, ISBN 978-3-322-90338-9, retrieved 2025-07-05
Farinella, P.; Milani, A.; Nobili, A.M.; Valsecchi, G.B. (1980). "Some remarks on the capture of Triton and the origin of Pluto". Icarus. 44 (3): 810–812. doi:10.1016/0019-1035(80)90148-7.
Meyer, Jennifer; Wisdom, Jack (2007). "Tidal heating in Enceladus". Icarus. 188 (2): 535–539. doi:10.1016/j.icarus.2007.03.001.
Lunine, Jonathan I. (1997), "Tidal heating", Encyclopedia of Planetary Science, Encyclopedia of Earth Science, Springer, Dordrecht, p. 828, doi:10.1007/1-4020-4520-4_408, ISBN 978-1-4020-4520-2, retrieved 2025-07-05
Peixinho, Nuno; Thirouin, Audrey; Tegler, Stephen C.; Di Sisto, Romina P.; Delsanti, Audrey; Guilbert-Lepoutre, Aurélie; Bauer, James G. (2020-01-01), Prialnik, Dina; Barucci, M. Antonietta; Young, Leslie A. (eds.), "Chapter 14 - From Centaurs to comets: 40 Years", The Trans-Neptunian Solar System, Elsevier, pp. 307–329, arXiv:1905.08892, doi:10.1016/b978-0-12-816490-7.00014-x, ISBN 978-0-12-816490-7, retrieved 2025-07-05
Laskar, Jacques (1997), "Solar system: Stability", Encyclopedia of Planetary Science, Encyclopedia of Earth Science, Springer, Dordrecht, pp. 762–766, doi:10.1007/1-4020-4520-4_382, ISBN 978-1-4020-4520-2, retrieved 2025-07-05
SchrÃ¶der, K.-P.; Connon Smith, Robert (2008-05-01). "Distant future of the Sun and Earth revisited". Monthly Notices of the Royal Astronomical Society. 386 (1): 155–163. doi:10.1111/j.1365-2966.2008.13022.x.
Gesicki, K.; Zijlstra, A. A.; Miller Bertolami, M. M. (2018-05-07). "The mysterious age invariance of the planetary nebula luminosity function bright cut-off". Nature Astronomy. 2 (7): 580–584. doi:10.1038/s41550-018-0453-9. hdl:11336/82487. ISSN 2397-3366.
Dyson, Freeman J. (1979-07-01). "Time without end: Physics and biology in an open universe". Reviews of Modern Physics. 51 (3): 447–460. doi:10.1103/RevModPhys.51.447. ISSN 0034-6861.
Jaki, Stanley L. (1972-07-01). "The Early History of the Titius-Bode Law". American Journal of Physics. 40 (7): 1014–1023. doi:10.1119/1.1986734. ISSN 0002-9505.
Phillips, J. P. (1965). "Kepler's Echinus". Isis. 56 (2): 196–200. doi:10.1086/349957. ISSN 0021-1753.
Krasinsky, G (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98–105. doi:10.1006/icar.2002.6837.
Pitjeva, E. V.; Pitjev, N. P. (2018). "Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft". Astronomy Letters. 44 (8–9): 554–566. arXiv:1811.05191. doi:10.1134/S1063773718090050. ISSN 1063-7737.
Romanishin, W.; Tegler, S. C.; Rettig, T. W.; Consolmagno, G.; Botthof, B. (2001-10-09). "1998 SM165: A large Kuiper belt object with an irregular shape". Proceedings of the National Academy of Sciences. 98 (21): 11863–11866. doi:10.1073/pnas.211147998. PMC 59815. PMID 11572937.
Pitjeva, E. V.; Pitjev, N. P. (2018). "Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft". Astronomy Letters. 44 (8–9): 554–566. arXiv:1811.05191. doi:10.1134/S1063773718090050. ISSN 1063-7737.

earthsky.org (Global: 6,724^th place; Simple English: 9,934^th place)

"Mars closest to Earth on January 12, 2025". earthsky.org. 2025-01-12. Retrieved 2025-07-09.

ebsco.com (Global: low place; Simple English: low place)

"Kuiper Belt Objects (KBOs) | EBSCO Research Starters". www.ebsco.com. Retrieved 2025-07-04.
"Planetary orbits: Couplings and resonances | EBSCO Research Starters". www.ebsco.com. Retrieved 2025-07-05.
"Trans-Neptunian object | EBSCO Research Starters". www.ebsco.com. Retrieved 2025-07-05.

elsevier.com (Global: 610^th place; Simple English: 663^rd place)

linkinghub.elsevier.com

Farinella, P.; Milani, A.; Nobili, A.M.; Valsecchi, G.B. (1980). "Some remarks on the capture of Triton and the origin of Pluto". Icarus. 44 (3): 810–812. doi:10.1016/0019-1035(80)90148-7.
Meyer, Jennifer; Wisdom, Jack (2007). "Tidal heating in Enceladus". Icarus. 188 (2): 535–539. doi:10.1016/j.icarus.2007.03.001.
Krasinsky, G (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98–105. doi:10.1006/icar.2002.6837.

eos.org (Global: low place; Simple English: low place)

Owen, Rebecca (2024-01-10). "Scientists Investigate How Heat Rises Through Europa's Ocean". Eos. Retrieved 2025-07-05.
Barbuzano, Javier (2023-08-14). "Subsurface Oceans Could Boost Exoplanet Habitability". Eos. Retrieved 2025-07-05.

geologyglasgow.org.uk (Global: low place; Simple English: low place)

bgray (2016-12-24). "Late Heavy Bombardment may not have happened". Geological Society of Glasgow. Retrieved 2025-07-05.

gsu.edu (Global: 1,911^th place; Simple English: 505^th place)

hyperphysics.phy-astr.gsu.edu

"Ellipses and Elliptic Orbits". hyperphysics.phy-astr.gsu.edu. Retrieved 2025-07-03.

handle.net (Global: 102^nd place; Simple English: 229^th place)

hdl.handle.net

Gesicki, K.; Zijlstra, A. A.; Miller Bertolami, M. M. (2018-05-07). "The mysterious age invariance of the planetary nebula luminosity function bright cut-off". Nature Astronomy. 2 (7): 580–584. doi:10.1038/s41550-018-0453-9. hdl:11336/82487. ISSN 2397-3366.

harvard.edu (Global: 18^th place; Simple English: 14^th place)

ui.adsabs.harvard.edu

Connelly, James N.; et al. (2012). "The absolute chronology and thermal processing of solids in the Solar protoplanetary disk". Science. 338 (6107): 651–655. Bibcode:2012Sci...338..651C. doi:10.1126/science.1226919. ISSN 0036-8075. PMID 23118187. S2CID 21965292.
Bouvier, Audrey; Wadhwa, Meenakshi (2010), "The age of the Solar System redefined by the oldest Pb–Pb age of a meteoritic inclusion.", Nature Geoscience, 3 (9): 637–641, Bibcode:2010NatGe...3..637B, doi:10.1038/ngeo941
Date based on oldest inclusions found to date in meteorites, thought to be among the first solid material to form in the collapsing solar nebula.
Jang-Condell, H. (2007). "Disk Instability vs. Core Accretion: Observable Discriminants". In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21st Century: 18. Bibcode:2007lyot.confE..18J.
Boss, Alan P. (2003). "Formation of gas and ice giants". Earths: Darwin/TPF and the Search for Extrasolar Terrestrial Planets. 539: 143. Bibcode:2003ESASP.539..143B. Retrieved 2025-07-04.
B. G. Elmegreen (1979). "On the disruption of a protoplanetary disc nebula by a T Tauri like solar wind". Astronomy & Astrophysics. 80 (1): 77. Bibcode:1979A&A....80...77E.
WC Rufus (1923). "The astronomical system of Copernicus". Popular Astronomy. 31: 510. Bibcode:1923PA.....31..510R. Retrieved 2009-05-09.

cfa.harvard.edu

"Planets and the Snow Line | Center for Astrophysics | Harvard & Smithsonian". www.cfa.harvard.edu. Retrieved 2025-07-04.
"Gravitational Dynamics | Center for Astrophysics | Harvard & Smithsonian". www.cfa.harvard.edu. Retrieved 2025-07-05.
"Planetary Nebulas | Center for Astrophysics | Harvard & Smithsonian". www.cfa.harvard.edu. Retrieved 2025-07-07.

adsabs.harvard.edu

Boss, Alan P. (2003). "Formation of gas and ice giants". Earths: Darwin/TPF and the Search for Extrasolar Terrestrial Planets. 539: 143. Bibcode:2003ESASP.539..143B. Retrieved 2025-07-04.
WC Rufus (1923). "The astronomical system of Copernicus". Popular Astronomy. 31: 510. Bibcode:1923PA.....31..510R. Retrieved 2009-05-09.

iau.org (Global: 1,985^th place; Simple English: 859^th place)

"IAU 2006 General Assembly: Result of the IAU Resolution votes". IAU. Archived from the original on 2014-04-29. Retrieved 2018-09-04.

illinois.edu (Global: 1,349^th place; Simple English: 1,887^th place)

psych.illinois.edu

"Tours of Model Solar Systems". www.psych.illinois.edu. Archived from the original on 2010-07-24. Retrieved 2025-07-09.

jstor.org (Global: 26^th place; Simple English: 27^th place)

Schramm, David N.; Clayton, Robert N. (1978). "Did a Supernova Trigger the Formation of the Solar System?". Scientific American. 239 (4): 124–139. doi:10.1038/scientificamerican1078-124. ISSN 0036-8733. JSTOR 24955827.

khanacademy.org (Global: 3,659^th place; Simple English: 556^th place)

"How Our Solar System Formed". www.khanacademy.org. Retrieved 2025-07-03.

kuriren.nu (Global: low place; Simple English: low place)

"Luleå är Sedna - Lokalt den 17 november 2005 - Arkiv - Norrbottens-Kuriren". www.kuriren.nu. Retrieved 2025-07-09.

lco.global (Global: low place; Simple English: low place)

"Planets and How They Formed". lco.global. Retrieved 2025-07-15.

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"8.2: Origin of the Solar System—The Nebular Hypothesis". Geosciences LibreTexts. 2019-11-04. Retrieved 2025-07-03.

msnucleus.org (Global: low place; Simple English: low place)

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nasa.gov

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nationalacademies.org (Global: 7,189^th place; Simple English: low place)

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nature.com (Global: 234^th place; Simple English: 139^th place)

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pubmed.ncbi.nlm.nih.gov

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api.semanticscholar.org

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search.worldcat.org

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Solar System (Simple English Wikipedia)

aanda.org (Global: 5,591st place; Simple English: 1,077th place)

aip.org (Global: 2,204th place; Simple English: 2,559th place)

pubs.aip.org

aps.org (Global: 1,503rd place; Simple English: 615th place)

link.aps.org

archive.org (Global: 6th place; Simple English: 4th place)

arxiv.org (Global: 69th place; Simple English: 49th place)

astro4dev.org (Global: low place; Simple English: low place)

astronomy.com (Global: low place; Simple English: 3,602nd place)

australianenvironmentaleducation.com.au (Global: low place; Simple English: low place)

bbc.co.uk (Global: 8th place; Simple English: 7th place)

berkeley.edu (Global: 580th place; Simple English: 549th place)

evolution.berkeley.edu

bgs.ac.uk (Global: 6,375th place; Simple English: 7,659th place)

britannica.com (Global: 40th place; Simple English: 12th place)

caltech.edu (Global: 887th place; Simple English: 618th place)

ned.ipac.caltech.edu

cambridge.org (Global: 305th place; Simple English: 225th place)

cfa-harvard.edu (Global: low place; Simple English: low place)

colorado.edu (Global: 2,526th place; Simple English: 1,241st place)

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columbia.edu (Global: 488th place; Simple English: 126th place)

dlr.de (Global: 9,342nd place; Simple English: low place)

doi.org (Global: 2nd place; Simple English: 3rd place)

earthsky.org (Global: 6,724th place; Simple English: 9,934th place)

ebsco.com (Global: low place; Simple English: low place)

elsevier.com (Global: 610th place; Simple English: 663rd place)

linkinghub.elsevier.com

eos.org (Global: low place; Simple English: low place)

geologyglasgow.org.uk (Global: low place; Simple English: low place)

gsu.edu (Global: 1,911th place; Simple English: 505th place)

hyperphysics.phy-astr.gsu.edu

handle.net (Global: 102nd place; Simple English: 229th place)

hdl.handle.net

harvard.edu (Global: 18th place; Simple English: 14th place)

ui.adsabs.harvard.edu

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adsabs.harvard.edu

iau.org (Global: 1,985th place; Simple English: 859th place)

illinois.edu (Global: 1,349th place; Simple English: 1,887th place)

psych.illinois.edu

jstor.org (Global: 26th place; Simple English: 27th place)

khanacademy.org (Global: 3,659th place; Simple English: 556th place)

kuriren.nu (Global: low place; Simple English: low place)

lco.global (Global: low place; Simple English: low place)

libretexts.org (Global: 3,627th place; Simple English: 716th place)

phys.libretexts.org

geo.libretexts.org

msnucleus.org (Global: low place; Simple English: low place)

msu.edu (Global: 1,844th place; Simple English: 614th place)

web.pa.msu.edu

nasa.gov (Global: 75th place; Simple English: 30th place)

science.nasa.gov

nasa.gov

nssdc.gsfc.nasa.gov

nationalacademies.org (Global: 7,189th place; Simple English: low place)

nap.nationalacademies.org

nature.com (Global: 234th place; Simple English: 139th place)

nhm.ac.uk (Global: 2,525th place; Simple English: 1,657th place)

nih.gov (Global: 4th place; Simple English: 6th place)

pubmed.ncbi.nlm.nih.gov

ncbi.nlm.nih.gov

nmsu.edu (Global: 6,873rd place; Simple English: 4,417th place)

astronomy.nmsu.edu

noaa.gov (Global: 212th place; Simple English: 80th place)

oceanservice.noaa.gov

oregonstate.edu (Global: 2,041st place; Simple English: 1,166th place)

volcano.oregonstate.edu

ox.ac.uk (Global: 613th place; Simple English: 755th place)

hsm.ox.ac.uk

planetary.org (Global: 5,100th place; Simple English: 4,159th place)

rochester.edu (Global: 2,691st place; Simple English: 1,463rd place)

pas.rochester.edu

sciencedirect.com (Global: 149th place; Simple English: 113th place)

scientificamerican.com (Global: 896th place; Simple English: 240th place)

semanticscholar.org (Global: 11th place; Simple English: 9th place)

api.semanticscholar.org

skyatnightmagazine.com (Global: low place; Simple English: low place)

solartoscale.com (Global: low place; Simple English: low place)

aanda.org (Global: 5,591^st place; Simple English: 1,077^th place)

aip.org (Global: 2,204^th place; Simple English: 2,559^th place)

aps.org (Global: 1,503^rd place; Simple English: 615^th place)

archive.org (Global: 6^th place; Simple English: 4^th place)

arxiv.org (Global: 69^th place; Simple English: 49^th place)

astronomy.com (Global: low place; Simple English: 3,602^nd place)

bbc.co.uk (Global: 8^th place; Simple English: 7^th place)

berkeley.edu (Global: 580^th place; Simple English: 549^th place)

bgs.ac.uk (Global: 6,375^th place; Simple English: 7,659^th place)

britannica.com (Global: 40^th place; Simple English: 12^th place)

caltech.edu (Global: 887^th place; Simple English: 618^th place)

cambridge.org (Global: 305^th place; Simple English: 225^th place)

colorado.edu (Global: 2,526^th place; Simple English: 1,241^st place)

columbia.edu (Global: 488^th place; Simple English: 126^th place)

dlr.de (Global: 9,342^nd place; Simple English: low place)

doi.org (Global: 2^nd place; Simple English: 3^rd place)

earthsky.org (Global: 6,724^th place; Simple English: 9,934^th place)

elsevier.com (Global: 610^th place; Simple English: 663^rd place)

gsu.edu (Global: 1,911^th place; Simple English: 505^th place)

handle.net (Global: 102^nd place; Simple English: 229^th place)

harvard.edu (Global: 18^th place; Simple English: 14^th place)

iau.org (Global: 1,985^th place; Simple English: 859^th place)

illinois.edu (Global: 1,349^th place; Simple English: 1,887^th place)

jstor.org (Global: 26^th place; Simple English: 27^th place)

khanacademy.org (Global: 3,659^th place; Simple English: 556^th place)

libretexts.org (Global: 3,627^th place; Simple English: 716^th place)

msu.edu (Global: 1,844^th place; Simple English: 614^th place)

nasa.gov (Global: 75^th place; Simple English: 30^th place)

nationalacademies.org (Global: 7,189^th place; Simple English: low place)

nature.com (Global: 234^th place; Simple English: 139^th place)

nhm.ac.uk (Global: 2,525^th place; Simple English: 1,657^th place)

nih.gov (Global: 4^th place; Simple English: 6^th place)

nmsu.edu (Global: 6,873^rd place; Simple English: 4,417^th place)

noaa.gov (Global: 212^th place; Simple English: 80^th place)

oregonstate.edu (Global: 2,041^st place; Simple English: 1,166^th place)

ox.ac.uk (Global: 613^th place; Simple English: 755^th place)

planetary.org (Global: 5,100^th place; Simple English: 4,159^th place)

rochester.edu (Global: 2,691^st place; Simple English: 1,463^rd place)

sciencedirect.com (Global: 149^th place; Simple English: 113^th place)

scientificamerican.com (Global: 896^th place; Simple English: 240^th place)

semanticscholar.org (Global: 11^th place; Simple English: 9^th place)

space.com (Global: 936^th place; Simple English: 799^th place)

springer.com (Global: 274^th place; Simple English: 367^th place)

uchicago.edu (Global: 230^th place; Simple English: 202^nd place)

ucr.edu (Global: 1,553^rd place; Simple English: 267^th place)

umich.edu (Global: 459^th place; Simple English: 270^th place)

universetoday.com (Global: 3,691^st place; Simple English: 1,874^th place)

uoregon.edu (Global: 3,144^th place; Simple English: 2,439^th place)

usgs.gov (Global: 167^th place; Simple English: 29^th place)

usra.edu (Global: 2,838^th place; Simple English: 3,600^th place)

utah.edu (Global: 2,446^th place; Simple English: 1,860^th place)

utexas.edu (Global: 916^th place; Simple English: 654^th place)

web.archive.org (Global: 1^st place; Simple English: 1^st place)

worldcat.org (Global: 5^th place; Simple English: 5^th place)