# Tag Info

Accepted

### Would touching a black hole of a small mass (the mass of an apple) cause you to spiral in and get dead?

This is just a quick calculation that shows what would happen to a black hole with a mass equal to the mass of an apple: It is shown that not only the builder of this black hole but also the whole ...
• 4,408
Accepted

• 16.9k
Accepted

### Can a neutron star become a black hole via cooling?

No (or at least not much). One of the essential properties of stars that are largely supported by degeneracy pressure, is that this pressure is independent of temperature and that is because although ...
• 113k
Accepted

### What happens to an astronaut (with a long rope trailing behind him), when he crosses the event horizon of a black hole?

Dale's answer is correct, but I want to further emphasize that nothing special happens in the vicinity of an event horizon. It's just like any other region of spacetime. Here's an analogy. Suppose you'...
• 18k

### Where does the kinetic energy of the orbiting black holes go after the merger?

The masses used in the gravitational wave analysis are those that the black holes would have had in their own frames in isolation. The best way to think about this is that the given masses of 36 &...
• 38.8k
Accepted

### Are black holes very dense matter or empty?

The phrase black hole tends to be used without specifying exactly what it means, and defining exactly what you mean is important to answer your question. The archetypal black hole is a mathematical ...
• 334k
Accepted

### Why is the information paradox restricted to black holes?

(The answers by Mark H and B.fox were posted while this one was being written. This answer says the same thing in different words, but I went ahead and posted it anyway because sometimes saying the ...
• 51.4k