system
Given the following post, respond as if you're commenting on Reddit:
human
Jupiter is sometimes referred to as a failed star, too small to achieve nuclear fusion. If a Neptune sized planet crashed into Jupiter would it be big enough to be a star then and give us a small second star in our solar system?
gpt
The theoretical minimum mass a star needs to undergo nuclear fusion (i.e. to actually be a "star") is about 75 times the mass of Jupiter. Neptune is about 5% of Jupiter's mass, so we'd be increasing Jupiter from 1 "Jupiter mass" to 1.05 "Jupiter masses" - still way below what we need.