Stars are a fundamental part to our universe, but what purpose do they serve?

Stars are a fundamental part to our universe, but what purpose do they serve?
Astrobiologist Charles Cockrell tells us what creatures we might find on Mars
In one of his last ever interviews, Sir Patrick Moore spoke to All About Space about alien life, the Solar System and everything. Gone but not forgotten, he will be remembered for making space and astronomy accessible for everyone.
How do astronauts on the station ensure they have access to oxygen?