Another mystery of the universe is solved.
We now know what a black hole actually looks like.
You probably have seen this image from the National Science Foundation -- but here's why it's so significant.
This black hole exists in a galaxy that's 55-million light years from Earth.
Scientists say this is something they thought would be impossible to see a generation ago.
This particular black hole has a mass that's nearly seven billion times more than the sun.
The amount of data gathered to show the black hole was so huge, it took half a ton worth of hard drives. That's a lot of selfies.
The image also confirmed Einstein's theory of general relativity, which described the nature of space, time and gravity.
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