Astronomers study planets and the sun in our own solar system. They also study other stars and their solar systems. They study our own Milky Way galaxy. They study other galaxies. They study the whole universe! Astronomers try to understand how the universe works. They study the life cycle of stars. How do stars form? Did you know that stars die? Astronomers want to learn what happens to stars during their life cycles. They want to understand what .....