The big moons of the solar system and Mercury, the only other known world that fits within this size range (Ganymede & Titan are larger). Top: Mercury, the Moon (Earth), Callisto (Jupiter) Ganymede (Jupiter) Bottom: Europa (Jupiter) Io (Jupiter), Titan (Saturn), Triton (Neptune) pic.twitter.com/pk1lJEAC7s
— Ted Stryk (@tsplanets) April 10, 2019
via Twitter https://twitter.com/tsplanets
April 11, 2019 at 04:52AM
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