The Planet Quiz Show  

Short Answer:

Jupiter is the largest planet, and Mercury is the smallest planet in our solar system.

Long Answer:

Jupiter, the largest planet in the solar system, has a diameter of 88,838 miles. Jupiter is so large that all of the remaining seven planets could easily fit within Jupiter’s interior. Since 1,413 mile in diameter, Pluto was demoted to a dwarf planet in August 2006, Mercury, with a diameter of 3,032 miles, has once again become the smallest official planet in the solar system. There are only two moons in the solar system that are larger than Mercury. Jupiter’s Ganymede is the largest moon with a diameter of 3,269 miles, while Titan, the largest satellite of Saturn, is 3,200 miles in diameter.

[Jupiter and Mercury compared]
This pictures shows the difference in size between the largest planet in our solar system, Jupiter, and the smallest planet in our solar system, Mercury.

[MESSENGER leaving Mercury]
Just in case you were wondering what that small “dot” of Mercury in the above picture looked like, here it is enlarged. If you have ever looked at the moon through a telescope, or seen a close-up picture of the moon, both the moon and Mercury seem to have a lot in common. The bright areas on Mercury are locations that have been more recently hit by meteorites. NASA MESSENGER/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington photo...
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