An Alien’s View of Our Solar System points out that from another solar system, it's probably Neptune that will be most visible because of it's gravitational effect on the Kuiper Belt.
STEREO Catches Mercury Acting Like a Comet "The STEREO mission to study the Sun also has observed some unusual comet-like features exhibited by the planet Mercury, with a coma of tenuous gas surrounding the planet and a very long tail extending away from the sun."
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