This is an introduction to Astronomy. Have you ever wondered how scientists can tell you how far away a start is or what objects are getting closer or further away in space? Have you ever wondered how scientists can say what the atmosphere of a planet is orbiting a start millions of miles away when you can’t even see the planet in the strongest of telescopes? Most of what we know in astronomy we know because of light. Light is an incredible tool that reveals much of what was hidden in years past.