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The Swiftest Planet
Sun-scorched Mercury is only slightly larger than Earth's moon. Like the moon, Mercury has very little atmosphere to stop impacts, and it is covered with craters. Mercury's dayside is super-heated by the sun, but at night temperatures drop hundreds of degrees below freezing. Ice may even exist in craters. Mercury's egg-shaped orbit takes it around the sun every 88 days.

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Jovian planet

Planet with a large diameter and low density. In our solar system the Jovian planets are: Jupiter, Saturn, Uranus and Neptune.

JPL

Acronym for NASA's Jet Propulsion Laboratory in Pasadena, Calif.

Jupiter
Jupiter is the fifth planet from the sun. It is the largest planet in our solar system. It is named for the king of ancient Roman gods.
HREF="../planets/profile.cfm?Object=Jupiter">More on Jupiter >>

Jupiter
 
Can't find it? Don't understand it? Ask us.
Q
Jovian planet

Planet with a large diameter and low density. In our solar system the Jovian planets are: Jupiter, Saturn, Uranus and Neptune.

JPL

Acronym for NASA's Jet Propulsion Laboratory in Pasadena, Calif.

Jupiter
Jupiter is the fifth planet from the sun. It is the largest planet in our solar system. It is named for the king of ancient Roman gods.
HREF="../planets/profile.cfm?Object=Jupiter">More on Jupiter >>

Jupiter