How do we find asteroids?

Distances to objects in space are very, very large. The nearest star (excluding the Sun), Alpha Centauri, is 41.23 trillion km, or 41,320,000,000,000 km!!

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.