![]() ![]() The ones that we know about are rendered visible because they happen to be next to another star where they orbit each other in space and that other star in many of these cases is losing its outer gaseous material. NdT: Yeah, exactly because you can sort of accidentally stumble on it. And those could be in your way as you journey across the galaxy. ![]() Then there's a much smaller kind, in some ways a more dangerous kind, that is the end product of the life of a star. But all of best data tell us that we got one in the middle of every galaxy. Those could be up to a million times the mass of the Sun, and we don't completely understand how they form. One of them is the monstrous black holes that we find in the centers of galaxies. NdT: There are two broad categories of black holes. So it's black and it's a hole, so we call it a black hole. And light is the fastest thing we know, so if you fall in and you can't travel faster than light, that's it, you're stuck. NdT: If light can't come out, then it's black. ![]()
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