Oort cloud
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 An artist's rendering of the Oort cloud and the Kuiper belt (inset). Sizes of individual objects have been exaggerated for visibility. |
The Oort cloud , or the Öpik–Oort cloud, is a hypothesized spherical cloud of comets which may lie roughly 50,000 AU, or nearly a light-year, from the Sun. This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun. The Kuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth of the Oort cloud's distance. The outer limit of the Oort cloud defines the cosmographical boundary of the Solar System and the region of the Sun's gravitational dominance.
| Oort Cloud Profile Oort Cloud Profile solarsystem.nasa.gov/planets/profile.cfm?Object=OortCloud - Web |
| The Kuiper Belt and The Oort Cloud The Kuiper Belt and The Oort Cloud www.nineplanets.org/kboc.html - Web |
| The effect of perturbations by the Alpha Cen A/B s... The effect of perturbations by the Alpha Cen A/B system on the Oort Cloud adsabs.harvard.edu/abs/1994QJRAS..35....1M - Web |
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