When you look at a star, you are looking at the light that came from the star. Because stars are so far away, it takes years for their light to reach us. Therefore, when you look at a star, you are actually seeing what it looked like years ago. It is entirely possible that some of the stars you see tonight do not actually exist anymore
Stay on task, late work stacks up fast. Don't be afraid to ask questions. Don't wait to study until right before the test, spread out studying throughout the unit. From someone taking two AP classes, they aren't easy but with hard work, they are worth it in the end.
Pretty sure it's C as it's the only one that isn't demonstrating something that would result from a disaster.