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With Explore the Planets, investigate the planets, their moons, and understand the processes that shape them. By G. Jeffrey Taylor, Ph.D. See our DVD collection.

Mercury

Mercury, the planet nearest the Sun, is also the smallest planet in the Solar System. Only slightly larger than the Earth's moon, Mercury's surface is covered with craters. This tiny planet does not have any rings or moons.

Visit another planet: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Dwarf Planets
This historic image is the first ever taken from a spacecraft in orbit about <a href="/mercury/mercury.html">Mercury</a>, the innermost planet of the solar system. Taken on 3/29/2011 by <a href="/space_missions/robotic/messenger/messenger.html">MESSENGER</a>, it shows numerous craters across the <a href="/mercury/Interior_Surface/Surface/surface_overview.html">surface</a> of the planet. Temperatures there can reach over 800F because Mercury is so close to the Sun and rotates so slowly. MESSENGER entered orbit around Mercury earlier in March 2011.<p><small><em>NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington</em></small></p><a href="/mercury/mercury.html">Mercury</a>, the innermost planet of the solar system, is a little bigger than the Earth's Moon. The <a href="/mercury/Interior_Surface/Surface/surface_overview.html">surface</a> of the planet is covered with craters, like the Moon, but temperatures there can reach over 800&deg;F because Mercury is so close to the Sun and rotates so slowly. This picture was taken by the <a href="/space_missions/robotic/messenger/messenger.html">MESSENGER spacecraft</a> in October 2008.<p><small><em>Image courtesy of NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington.</em></small></p>

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Explore Mercury

Mercury's Interior and Surface

Mercury, the innermost planet of the solar system, is a little bigger than the Earth's Moon. ...Read more

Atmosphere of Mercury

Mercury has very little atmosphere. The planet's small size means that its gravity is too weak ...Read more

Magnetosphere of Mercury

Mercury is the only terrestrial planet other than the Earth that has a significant magnetic ...Read more

Mercury's Poles

If Uranus is the "tilted planet", Mercury might be called the "upright planet". The spin axis ...Read more

Planetary Facts

All of the relevant information about Mercury collected on one page, including details about size, orbit ...Read more

Myth and Culture

Here are two stories about Mercury, one of the gods in the Roman pantheon. Mercury was identified ...Read more

Missions to Mercury

A table containing information about the spacecraft that have visited Mercury ...Read more

Images and Multimedia

Access wonderful captioned photos and illustrations that will inspire and excite you. ...Read more

Mercury Links

These are links to other great web sites about Mercury. But beware: you don't want to get ...Read more

More about Mercury

Historical Events

9/17 Antony van Leeuwenhoek discovered bacteria on this date in 1683
9/19 8.0 Magnitude Earthquake Hits Mexico City in 1985 Details
9/21 7.6 Magnitude Earthquake hits Central Taiwan, 1999 Details

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Did you know?

Did you know that the Earth’s crust is thinner under the oceans than it is on the continents?

Did you know that many cultures have studied the heavens in the past?

 

Earth and Space Science Concept of the Day

Do you know what this word or phrase means?

Graben
xGraben : A graben is a down-dropped block of the earth's crust resulting from extension, or pulling, of the crust.

Click on the word to find out!

Research Highlights

Oldest Earth Mantle Reservoir Discovered

Researchers have found a primitive Earth mantle reservoir on Baffin Island in the Canadian Arctic. Geologist Matthew Jackson and his colleagues from a multi-institution collaboration report the finding--the...Read more


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