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-Heather R. Smith/NASA Educational Technology Services
Everybody knows that The Universe has many secrets, and we cannot comprehend it as ourself. It needs big technology even NASA still cannot find out more about Universe. This article is part of the NASA Knows (Grade K-4) series where it describes of what Black hole is.
Black hole is a thing that place in space where can pull everything in just like vacuum cleaner. The gravity inside there is very strong, so everything that had been inside there cannot get out. Black hole is invisible. Because no one and light can get out, people can't see black holes...click here to continue!
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