Editing 681: Gravity Wells
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==== Outer Planets ==== | ==== Outer Planets ==== | ||
− | * {{w|Jupiter}}: Jupiter is so massive and dense that it is | + | * {{w|Jupiter}}: Jupiter is so massive and dense that it is comparable in mass to a {{w|Brown dwarf}} which is the smallest kind of star. Saturn, while similar in size, is composed of much lighter gas material. Hence Saturn's mass and therefore its gravitational pull are much smaller. If a few dozen times the mass of gasses contained in Jupiter had condensed in that location, the gravitational pull would cause the pressure and temperature to increase to a level that is sufficient to ignite {{w|Nuclear fusion|nuclear fusion}}. Had that happened during the creation of our solar system, we would have two {{w|Sun|Suns}} and our solar system would be a {{w|Binary system (astronomy)|Binary system}}. Jupiter has {{w|Moons of Jupiter|67 moons}} of which 3 are shown; |
** {{w|Ganymede (moon)|Ganymede}} — moon of Jupiter, no facts given | ** {{w|Ganymede (moon)|Ganymede}} — moon of Jupiter, no facts given | ||
** {{w|Io (moon)|Io}} — moon of Jupiter, no facts given | ** {{w|Io (moon)|Io}} — moon of Jupiter, no facts given |