system
Given the following post, respond as if you're commenting on Reddit:
human
How do we study black holes if everything that gets close to it, even photons, gets sucked in and crushed? What methods are used to verify what we are looking at is a black hole?
gpt
Someone will offer a million times better answer, and so this may be in vain; but most observations in space happen by seeing how the observed item is in relation to other things. Things like black holes and dark matter may not be directly observable, but their affect on their surroundings are very observable phenomenon.