The closest planet to the Sun is the Mercury. It is a terrestrial planet. That means a planet made from rock like Earth.Only one spacecraft, Mariner 10, has visited Mercury. Much of what we know about this planet came from this mission.
How big is Mercury?
Comparison of the size of Mercury to the Earth Mercury is 4879 km across. Mercury's diameter is just less than half the diameter of the Earth. It is the smallest planet in the Solar System. Only dwarf planets like Pluto are smaller. Mercury's small size and its closeness to the Sun sometimes make it difficult to see without a telescope or binoculars. The best time to spot Mercury in the sky is just after the sun goes down at night or shortly before it rises in the morning.
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