How do we find asteroids?

Distances to objects in space are very, very large.

Have you ever wondered how big a galaxy is? They contain millions to billions of stars but what does that really mean for size?

Reading about sizes in a book is one thing, but what if you could make an observation of a galaxy and then measure its size?

You have probably seen the Moon in the sky but have you ever studied it in detail?

Many years ago, a mathematician named Johannes Kepler created a set of rules explaining planets' movement in our Solar System.