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Ottewell, Guy (1989). "The Thousand-Yard Model: or, Earth as a Peppercorn". NOAO Educational Outreach Office. Archived from the original on 10 July 2016 . Retrieved 10 May 2012.

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The Local Bubble is a small superbubble compared to the neighboring wider Radcliffe Wave and Split linear structures (formerly Gould Belt), each of which are some thousands of light-years in length. [216] All these structures are part of the Orion Arm, which contains most of the stars in the Milky Way that are visible to the unaided eye. The density of all matter in the local neighborhood is 0.097 ±0.013 M ☉·pc −3. [217] a b Krasinsky, G. A.; Pitjeva, E. V.; Vasilyev, M. V.; Yagudina, E. I. (July 2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98–105. Bibcode: 2002Icar..158...98K. doi: 10.1006/icar.2002.6837. What are the characteristics of the Solar System that lead to the origins of life?". NASA Science (Big Questions). Archived from the original on 8 April 2010 . Retrieved 30 August 2011. A Star with two North Poles". NASA Science: Share the Science. 22 April 2003. Archived from the original on 1 April 2022 . Retrieved 1 April 2022.a b Ryden, Robert (December 1999). "Astronomical Math". The Mathematics Teacher. 92 (9): 786–792. doi: 10.5951/MT.92.9.0786. ISSN 0025-5769. JSTOR 27971203. Archived from the original on 12 April 2022 . Retrieved 29 March 2022. Alexander, Amir (2006). "New Horizons Set to Launch on 9-Year Voyage to Pluto and the Kuiper Belt". The Planetary Society. Archived from the original on 22 February 2006 . Retrieved 8 November 2006. What Color is the Sun?". Stanford Solar Center. Archived from the original on 30 October 2017 . Retrieved 23 May 2016. Overview: Titan". NASA Science: Solar System Exploration. 27 June 2019. Archived from the original on 31 March 2022 . Retrieved 31 March 2022. Woolfson, M. (2000). "The origin and evolution of the solar system". Astronomy & Geophysics. 41 (1): 12. Bibcode: 2000A&G....41a..12W. doi: 10.1046/j.1468-4004.2000.00012.x.

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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. Within ten light-years of the Sun there are relatively few stars, the closest being the triple star system Alpha Centauri, which is about 4.4 light-years away and may be in the Local Bubble's G-Cloud. [218] Alpha Centauri A and B are a closely tied pair of Sun-like stars, whereas the closest star to Earth, the small red dwarf Proxima Centauri, orbits the pair at a distance of 0.2 light-year. In 2016, a potentially habitable exoplanet was found to be orbiting Proxima Centauri, called Proxima Centauri b, the closest confirmed exoplanet to the Sun. [219] Nagasawa, M.; Thommes, E. W.; Kenyon, S. J.; Bromley, B. C.; Lin, D. N. C. (2007). "The Diverse Origins of Terrestrial-Planet Systems" (PDF). In Reipurth, B.; Jewitt, D.; Keil, K. (eds.). Protostars and Planets V. Tucson: University of Arizona Press. pp.639–654. Bibcode: 2007prpl.conf..639N. Archived (PDF) from the original on 12 April 2022 . Retrieved 10 April 2022. a b The mass of the Solar System excluding the Sun, Jupiter and Saturn can be determined by adding together all the calculated masses for its largest objects and using rough calculations for the masses of the Oort cloud (estimated at roughly 3 Earth masses), [43] the Kuiper belt (estimated at 0.1 Earth mass) [44] and the asteroid belt (estimated to be 0.0005 Earth mass) [45] for a total, rounded upwards, of ~37 Earth masses, or 8.1% of the mass in orbit around the Sun. With the combined masses of Uranus and Neptune (~31 Earth masses) subtracted, the remaining ~6 Earth masses of material comprise 1.3% of the total orbiting mass. Fajans, J.; Frièdland, L. (October 2001). "Autoresonant (nonstationary) excitation of pendulums, Plutinos, plasmas, and other nonlinear oscillators" (PDF). American Journal of Physics. 69 (10): 1096–1102. Bibcode: 2001AmJPh..69.1096F. doi: 10.1119/1.1389278. Archived from the original (PDF) on 7 June 2011 . Retrieved 26 December 2006.

a b c d e f Williams, David (27 December 2021). "Planetary Fact Sheet - Metric". NASA Goddard Space Flight Center . Retrieved 11 December 2022. Inner Solar System". NASA Science: Share the Science. Archived from the original on 10 April 2022 . Retrieved 2 April 2022. a b c Steigerwald, Bill (24 May 2005). "Voyager Enters Solar System's Final Frontier". NASA. Archived from the original on 16 May 2020 . Retrieved 2 April 2007.

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