Hi, I have a few questions for you guys (I'm studying for a test right now on Astronomy).
1) What is the only thing that is different among all types of electromagnetic radiation?
2) What is a spectroscope? What does it do?
3) What elements are in stars?
4) How are stars different?
5) What are the two key factors when determining a stars luminosity?
6) In what stage do most stars spend their lives?
7) What are perihelion and aphelion?
8) What are circumpolar constellations?