Buie, Marc W. (5 April 2008). "Orbit Fit and Astrometric record for 136472". SwRI (Space Science Department). Archived from the original on Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets?". Cornell University. Archived from the original on 3 January 2009 . Retrieved 1 March 2009. Quaoar (43.69AU average from the Sun) is the second-largest known object in the classical Kuiper belt, after Makemake. Its orbit is significantly less eccentric and inclined than those of Makemake or Haumea. [169] It possesses a ring system and one known moon, Weywot. [172] The astronomical unit [AU] (150,000,000km; 93,000,000mi) would be the distance from the Earth to the Sun if the planet's orbit were perfectly circular. [54] For comparison, the radius of the Sun is 0.0047AU (700,000km; 400,000mi). [55] Thus, the Sun occupies 0.00001% (10 −5%) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly one millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 astronomical units (780,000,000km; 480,000,000mi) from the Sun and has a radius of 71,000km (0.00047AU; 44,000mi), whereas the most distant planet, Neptune, is 30AU (4.5 ×10 9km; 2.8 ×10 9mi) from the Sun. [48] [56]

My Very Own Solar System User Manual Brainstorm E2002 My Very Own Solar System User Manual Brainstorm

Kallenrode, May-Britt (2004). Space Physics: An introduction to plasmas and particles in the heliosphere and magnetospheres (3rded.). Berlin: Springer. p.150. ISBN 978-3-540-20617-0. OCLC 53443301. Archived from the original on 20 April 2022 . Retrieved 1 April 2022.Williams, David R. (7 September 2006). "Saturn Fact Sheet". NASA. Archived from the original on 4 August 2011 . Retrieved 31 July 2007. Pogge, Richard W. (1997). "The Once & Future Sun". New Vistas in Astronomy. Archived from the original on 27 May 2005 . Retrieved 7 December 2005. Lewis, John S., ed. (2004). Physics and Chemistry of the Solar System (2nded.). Elsevier. p.147. ISBN 978-0-124-46744-6. OCLC 475009299.

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Morbidelli, A.; Bottke, W.F.; Froeschlé, Ch.; Michel, P. (January 2002). W.F. Bottke Jr.; A. Cellino; P. Paolicchi; R.P. Binzel (eds.). "Origin and Evolution of Near-Earth Objects" (PDF). Asteroids III: 409–422. Bibcode: 2002aste.book..409M. doi: 10.2307/j.ctv1v7zdn4.33. Archived (PDF) from the original on 9 August 2017 . Retrieved 30 August 2009. Phillips, J. P. (1965). "Kepler's Echinus". Isis. 56 (2): 196–200. doi: 10.1086/349957. ISSN 0021-1753. JSTOR 227915. S2CID 145268784. The four outer planets, also called giant planets or Jovian planets, collectively make up 99% of the mass known to orbit the Sun. [f] Jupiter and Saturn are together more than 400 times the mass of Earth and consist overwhelmingly of the gases hydrogen and helium, hence their designation as gas giants. [129] Uranus and Neptune are far less massive—less than 20 Earth masses ( M 🜨) each—and are composed primarily of ice. For these reasons, some astronomers suggest they belong in their own category, ice giants. [130] All four giant planets have rings, although only Saturn's ring system is easily observed from Earth. The term superior planet designates planets outside Earth's orbit and thus includes both the outer planets and Mars. [89]

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million years, and is thought to be the date of the formation of the first solid material in the collapsing nebula. [9] Tancredi, G.; Favre, S. A. (2008). "Which are the dwarfs in the Solar System?". Icarus. 195 (2): 851–862. Bibcode: 2008Icar..195..851T. doi: 10.1016/j.icarus.2007.12.020. The asteroid belt and Kuiper belt are not added because the individual asteroids are too small to be shown on the diagram. Dooling, Dave (8 December 1998). "Solar Wind blows some of Earth's atmosphere into space". NASA Science: Share the Science. Archived from the original on 8 April 2022 . Retrieved 1 April 2022.