There are a million space rocks nearby. Astronomers have only mapped about 9,700 of them.
Scientists have a new estimate for the geological age of one of Mercury's oldest regions.
In his book Cosmos, the late scientist Carl Sagan talks about the way in which the earth is regularly struck by material from outer space. These collisions with space debris can be minor–as in a shooting star on a summer night–or amazingly destructive, as in the collision that probably killed off the dinosaurs. Thankfully, the […]