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What do we know about black holes?

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Now we must ask why astronomers think the objects Cygnus X-1, Sagittarius A*, and the like are black holes and not some other thing – especially since we aren't able to observe a black hole directly. read more

We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby. If a black hole passes through a cloud of interstellar matter, for example, it will draw matter inward in a process known as accretion. read more

We know that black holes exist in some form or another, but no one has seen them with their own eyes or a telescope, since they’re either black or shrouded by hot gas from stuff torn apart by their gravity. read more

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Part I: Black Holes and SpaceTime - ppt video online download
Source: slideplayer.com

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