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Okay, there are two problems with your question. Firstly, define space. Like, do you mean our solar system, galaxy or the universe in general? Secondly, do you consider Pluto a planet anymore?

If you're just talking about the solar system, no. The second smallest planet in our solar system is Mars. This does not include Pluto. The size order of all the planets is: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mercury and then Pluto (if you still consider it a planet).

Our galaxy is huge and could contain millions of other planets ranging in size from the size of a pea to the size of a small star. The definition of a planet is spherical object which orbits around a star.

Even though our galaxy is huge, there are millions of billions of other galaxies out there, many bigger than ours, so there is no chance that out planet is the second smallest in the universe.

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15y ago

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