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a lot more on this coming up, jon. jon: what exploded over russia was a meteor. what is about to fly by the earth later today is an astroid. they are both essentially big space rocks. so what is the difference? an astroid defined as a large rocky body in orbit around the sun while a meteor is a smaller, rocky body that has entered the earth s atmosphere. you can sometimes see them in the sky. we know them as shooting stars. if a meteor survives its fiery trip to the ground, which doesn t actually happen all that often, it then becomes a meteorite. jenna: good information. if any of our viewers are on a game show, jon that will come in helpful, the quiz section of that. jon: space junk for a hundred please. jenna: i like it. this isn t the first time a meteor has caused damage in russia. the most powerful meteor explosion in recorded history happened over siberia in 1908. it was known as the t u.n. gusta event and the shock wave from