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The zone of habitability of the Solar System is conventionally located in the inner Solar System, where planetary surface or atmospheric temperatures admit the possibility of liquid water. [68] Habitability might be possible in subsurface oceans of various outer Solar System moons. [69]
The inner Solar System's period of giant impacts probably played a role in Earth acquiring its current water content (~6 × 10 21 kg) from the early asteroid belt. Water is too volatile to have been present at Earth's formation and must have been subsequently delivered from outer, colder parts of the Solar System. [63]
The Hills cloud is thought to be a secondary reservoir of cometary nuclei and the source of replenishment for the tenuous outer cloud as the latter's numbers are gradually depleted through losses to the inner Solar System. The outer Oort cloud may have trillions of objects larger than 1 km (0.6 mi), [4] and billions with diameters of 20 ...
The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star; The inner Solar System and the terrestrial planets. 2021 PH27; Mercury. Mercury-crossing minor planets; Venus. Venus-crossing ...
Centaurs and TNOs that reach the inner Solar System can modify the orbits of main belt asteroids, though only if their mass is of the order of 10 −9 M ☉ for single encounters or, one order less in case of multiple close encounters. However, Centaurs and TNOs are unlikely to have significantly dispersed young asteroid families in the main ...
The impact occurred during a period of heavy bombardment in the inner solar system by space rocks thought to have been dislodged following a change in the orbits of the solar system's giant ...
Brown, Rein and Malhotra think that sometime during the Solar System’s formation, an uninvited guest anywhere between 2 and 50 times the mass of Jupiter barged in fast enough to both shift the ...
From this he concluded that "the outer region of the solar system, beyond the orbits of the planets, is occupied by a very large number of comparatively small bodies" [26]: xii and that, from time to time, one of their number "wanders from its own sphere and appears as an occasional visitor to the inner solar system", [26]: 2 becoming a comet.