Classify a Star AK
Distances in Space
What is a star?
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!
Investigate: Counting stars in the Milky Way
Investigate: Measure the Size of a Galaxy
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?
Measure the Speed of Light
Calculate the Speed of the Planets
Did you know the Earth is travelling around the Sun at nearly 107,000 kilometres per hour?
Explore Gravity
Use our simulator to investigate the effect of gravity on other worlds. Then use your measurements and a bit of maths to calculate the strength of gravity in each location across the Solar System!