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The sky can be so many different things: it can be big, beautiful and blue, or grey, cloudy and rainy. It can also be full of stars, or full of orange and red clouds at sunset or sunrise. (Shutterstock)

Curious Kids: What is the sky?

A young reader asks: What is the sky?
Shutterstock

Curious Kids: how did the first person evolve?

The oldest known skeleton of our species Homo sapiens is about 300,000 years old. But there was a time when humans didn’t exist at all and the world was covered in nothing but slime.
The good thing about space is that – even though it has lots of dangerous stuff floating in it, and lots of exploding stars – it’s so big and empty that it almost doesn’t matter. NASA/CXC/U.Texas

Curious Kids: If a star explodes, will it destroy Earth?

Are there stars other than the Sun that might explode soon close to us? Yes, there are! As long as by ‘soon’ we mean within a million years.

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