Stargazers will need to keep an eye on a close asteroid fly-by on Wednesday.
NASA says the rock about the size of six football fields will pass close to Earth on April 19th.
The asteroid will be more than 1 million miles away.
Smaller asteroids pass within distance all the time. But it has been 13 years since such a large one came close.
You will be able to see it with a telescope or you can watch it online.
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