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Conservation of Momentum
In this practical activity students explore how momentum is conserved when two objects collide.
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Measuring the Universe
This video explains how we can measure the distance to near and far objects in the universe using parallax, 'standard candles' and the Doppler effect.
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Stars and the H-R Diagram
Royal Observatory Greenwich astronomers explain how stars can be categorised and their evolution studied by tracking their movement across a very important graph in stellar evolution - the Hertzsprung-Russell diagram.
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Diversity Art and Citizenship: Black Histories
Embark on new perspectives of the past and unpack our fascinating shared Black British History for your pupils.
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Ted asks: How do you build a rocket?
Join the Royal Observatory Greenwich’s very own Ted, along with new friends Pip and Cub, to learn all about different materials and how to build a rocket!
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Ted asks: What is it like on Mars?
Join the Royal Observatory Greenwich’s very own Ted, along with new friends Pip and Cub, on an adventure to Mars to learn all about the planet and what we would need to live there!
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How do we know how old the Sun is?
ROG astronomer Brendan explains how we determine the age of our Solar System from space rocks and how we can work out how long the Sun has left before it engulfs the inner planets.
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How big is the Universe?
Royal Observatory astronomer Liz shows us the expanding nature of the Universe and how this affects the light reaching us from distant galaxies, some of which will remain forever hidden from our view.
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What’s inside a black hole?
Royal Observatory astronomer Rad explains where black holes come from, how we know they’re there and the strange effects they have on surrounding matter. 
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What Makes the Universe Colourful?
Our Universe is a facinating and beautiful place. Join the Royal Observatory Greenwich astronomers as they head off on a voyage of discovery to find out just what it is that makes it so colourful.