Explore Mercury
![](/images/icons/mercury_interior.jpg)
Mercury, the innermost planet of the solar system, is a little bigger than the Earth's Moon. ...
Read more
![](/images/icons/mercury_atmosphere.jpg)
Mercury has very little atmosphere. The planet's small size means that its gravity is too weak ...
Read more
![](/images/icons/mercury_magnetosphere.jpg)
Mercury is the only terrestrial planet other than the Earth that has a significant magnetic ...
Read more
![](/images/icons/mercury_poles.jpg)
If Uranus is the "tilted planet", Mercury might be called the "upright planet". The spin axis ...
Read more
![](/images/icons/mercury_facts.jpg)
All of the relevant information about Mercury collected on one page, including details about size, orbit ...
Read more
![](/images/icons/mercury_myth.jpg)
Here are two stories about Mercury, one of the gods in the Roman pantheon. Mercury was identified ...
Read more
![](/images/icons/mercury_missions.jpg)
A table containing information about the spacecraft that have visited Mercury ...
Read more
![](/images/icons/mercury_images.jpg)
Access wonderful captioned photos and illustrations that will inspire and excite you. ...
Read more
![](/images/icons/mercury_links.jpg)
These are links to other great web sites about Mercury. But beware: you don't want to get ...
Read more
Did you know?
Did you know that there is a
strange hexagon in the atmosphere at the northern pole of Saturn?
Did you know that the Japanese god Susanowo was the god of the sea and storms, and that he had a terrible temper?
Earth and Space Science Concept of the Day
Do you know what this word or phrase means?
ChinookxChinook : A dry down-slope wind which occurs on the downwind side of a mountain range. It is a rain shadow wind which results from the subsequent (adiabatic) warming of air which has dropped most of its moisture on windward slopes.
Click on the word to find out!
Research Highlights
A new study has found that a mixing of two different types of magma is the key to the historic eruptions of Mount Hood, Oregon's tallest mountain, and that eruptions often happen in a relatively short...
Read more![](/olpa/images/mthood_small.jpg)