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Gray planet Mercury with craters and rays of material ejected by impactors like asteroids.

Mercury

Mercury is the closest planet to the Sun, and the smallest planet in our solar system. It’s only slightly larger than Earth’s Moon.

Mercury Facts

Mercury is the smallest planet in our solar system and the nearest to the Sun.

Mercury is only slightly larger than Earth’s Moon. It’s the fastest planet, zipping around the Sun every 88 Earth days. Mercury is named for the swiftest of the ancient Roman gods.

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Gray-colored Mercury with bright ejecta visible in craters.
NASA’s Mercury MESSENGER took this image of Mercury’s southern hemisphere.
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Eyes on the Solar System lets you explore the planets, their moons, asteroids, comets and the spacecraft exploring them from 1950 to 2050.

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Gray and white smiling,cartoon-like illustration of planet Mercury.

For Kids: All About Mercury

Facts about Mercury for kids.

Mercury in several different colors

Mercury Resource Package

Activities that can be done at home as well as videos, animations, printable graphics, and podcasts.

A full globe view of gray-colored planet Mercury as seen from a spacecraft. Craters and white patches also are visible.

NASA Photojournal: Mercury

Images of Mercury from spacecraft.

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Mars

Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited…

Jupiter