The sun suddenly stops fusing hydrogen and loses its energy source. Which is true?
Which is most likely the cause of the extreme heating in the chromosphere and corona?
How do we know when a coronal mass ejection is on its way?
high luminosity, short-lived, large radius, hot, blue
You discover a star and its spectrum reveals that it’s a G-type main sequence star. How old is it?
If angular momentum is conserved what happens if r goes down (no change in m)?
Protostars start out relatively cool and dark (compared to stars). If the axes of the HR diagram were stretched to these temperatures a protostar would appear at the:
What happens if the cloud collapses but never quite gets to stardom?
What will happen when the hydrogen in the core runs out?
With fusion again supporting the core, our star rests on the Horizontal Branch:
A star moves upwards and to the right on the HR diagram. What is happening in its core?
Supernova 1987A was the most recent nearby supernova. Where did it occur?