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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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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.
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What is Gravity?
From Newton’s longstanding ideas to Einstein’s revolutionary theories, Royal Observatory Greenwich astronomers explain how our understanding of gravity has changed from looking at how gravity affects us in our daily lives and how it governs what we observe in space.
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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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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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The Rosetta Mission
The Rosetta Mission has captured the interest and imagination of a generation and it is not over yet! Take a look at our video which explains what Rosetta and Philae have achieved as well as the impact the mission has had on our knowledge of our very own solar system.
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Space rocks
There are lots of names associated with space rocks, so what is the difference? Join the Royal Observatory Greenwich astronomers to find out.
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Newton's Laws of Motion
Join our Royal Observatory Greenwich astronomers as they go on an epic journey to find out how Newton's Laws of Motion work in space. Buckle your seatbelts, you're in for an adventure!
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Are there aliens?
Life began on the Earth around 3.5 billion years ago. Could life have evolved on other planets and if so where are they? Astronomers at the Royal Observatory Greenwich explain how we might detect them in this video.
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Shadows On Other Worlds
Join the astronomers at the Royal Observatory Greenwich as they go on an adventure to discover what shadows look like on other worlds.