Stars

  1. How do stars begin?
  2. What is meant by the term "protostar"?
  3. How do astronomers measure the temperatures of stars?
  4. How do astronomers determine if stars are moving toward us or away from us?
  5. What is a "main sequence" star?
  6. What is a "red giant"?
  7. What is a "white dwarf"?
  8. What is a "neutron star"?
  9. What is a "black hole"?