system
Given the following post, respond as if you're commenting on Reddit:
human
Are stars the only natural nuclear fusion users in the universe?
gpt
Basically, anything massive enough that fusion occurs due to gravitational collapse is more or less the effective definition of a star (if you leave out stellar remnants like white dwarfs, neutron stars and black holes). There is no other way than gravitational collapse of a gigantic amount of matter that creates enough heat and pressure for fusion to occur naturally (which is why the current approach to man made fusion is to heat a plasma much further than it would be in the core of a star to compensate for the lack of pressure).