NASAのインスタグラム(nasa) - 11月24日 23時20分

It’s #BlackFriday, but we don’t do much shopping in space. Instead, join us for our 5th annual #BlackHoleFriday where we’ll share awesome images and facts about black holes! A black hole is a place in space where gravity pulls so much that even light cannot get out.
The gravity is so strong because matter has been squeezed into a tiny space. Black holes are formed when giant stars explode at the end of their lifecycle. If the star has enough mass, it will collapse on itself down to a very small size. Because no light can get out, people cannot see black holes...they’re invisible! Space telescopes with special tools can help find black holes by seeing how stars that are very close to them act differently than other stars.
Credit: NASA
#nasa #space #blackfriday #blackholefriday #friday #blackhole #blackholes #light #star #explosion #mass #annual #facts

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