What is the interstellar medium made of? How do we know? How do stars form?
Describe a black hole in detail. How do astronomers detect them if they give off no light?
What kinds of galaxies are there in the universe? What are their characteristics? How do we measure distances to nearby and distant galaxies?
What is Hubble's law? What does it tell us about the evolution of the universe?
Describe a black hole in detail. How do astronomers detect them if they give off no light?
What kinds of galaxies are there in the universe? What are their characteristics? How do we measure distances to nearby and distant galaxies?
What is Hubble's law? What does it tell us about the evolution of the universe?