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How big can a star get?

The planet Upsilon Andromedae b in close orbit to its parent star (NASA/JPL-Caltech) Understanding the structure, dynamics, and chemistry of planetary atmospheres is key to exoplanetary science. It’s sobering to realize that as of now it is still an enormous challenge to model even the atmospheres of planets in our own solar system

At the core of our Milky Way galaxy lies a black hole. Like all black holes, its gravitational pull is so strong that it swallows anything that ventures too close--even light.