Earth's atmosphere protects Earth's surface by burning up most objects and pieces of space debris as they fall through it. Because Mercury doesn't have a true atmosphere, its surface is riddled with thousands of craters. None of them quite compare, however, to Mercury's largest crater. Astronomers believe that a 100 km wide asteroid hit Mercury about 4 billion years ago, creating a area of impact 1,525 km wide. This crater, called the Caloris Basin, is so large that the entire U.S. state of Texas (about 1,244 km wide) would fit inside it, with plenty of room to spare.
We're trying to get some mobile games up and
running, but unfortunately our flash games
don't work on phone or tablet. How about
some hilarious science jokes
How many times can you juggle the ball?
By submitting a comment, you promise that you
have your parent or guardian's permission,
are 13 or older, and
Bounce your charge ball around the maze and collect the orbs.
Match the colors to help Steak and Jake deliver the milk.
Figure out the technique to swap all the arrows.
Fill in the lines to complete your masterpiece.
Do you know whether you can weather the storm of these weather jokes?
Strawberries might not actually be berries, but these jokes are actually berry funny!
You'll bee sure to laugh out loud at these insect and bug jokes!
These jokes are sweet, man!
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