Some of astronomy's big questions - answered

What are the different types of light? How does distance affect our ability to communicate with spacecraft like NASA’s Curiosity Mars rover? These short videos, produced for ABC Stargazing Live, answer some of astronomy's big questions.

What do rainbows and astronomy have in common?
How do astronomers use infrared light to explore our Universe?
How do astronomers use radio light to learn about space?
How do astronomers use ultraviolet light to make discoveries?
How big is our solar system?
How does distance affect space communication?
What makes a planet a planet?