Black holes are the strangest things that exist in our universe; they are holes in space itself. They exist in various sizes; the biggest one discovered so far has a whopping mass of 17 billion solar masses or about 10% of the mass of the whole Milky Way galaxy. It's worth studying these objects in a bit more detail; you can read our article about black holes in Sun.org's encyclopedia.

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Black hole Cygnus X-1 Black hole Cygnus X-1
A gas cloud near the Milky Way's central black hole A gas cloud near the Milky Way's c...
Black hole Black hole

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Published by Published or last modified on 2014-07-07