GCSE Astronomy

Have you ever wondered why stars look different colours? What do these colours mean? How do we know what stars are made of? Explore these questions with our classify a star activity.

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!!

We can see thousands of stars in the night sky - small points of light in the vastness of space. But what are stars? How do they make light? Why are they different colours? Watch this video to find out some more information about stars!

Galaxies are collections of millions, or billions of stars. The Milky Way is the galaxy in which we live, orbiting around it’s centre in a distant spiral arm.

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?

How far apart are the planets in the Solar System. The answer may surprise you!

The distance between the planets in our Solar System is not regular. The inner 4 rocky planets are spaced much more tightly than the outer 4 giant planets.

Download, print and display this free poster!

Have you ever noticed how the night sky looks different every single day? This is because we are constantly moving in space so our view changes.