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Curious Kids: why is there gravity?

  • Written by David Blair, Emeritus Professor, ARC Centre of Excellence for Gravitational Wave Discovery, OzGrav, University of Western Australia
Curious Kids: why is there gravity?Flickr/Kelly Teague, CC BY

Why is there gravity? Xander, aged 3, Lindfield, Sydney, NSW.

Curious Kids: why is there gravity?

Hi Xander, great question!

I’m told you were rolling marbles when you asked that question, wondering why they roll down more easily than they roll up.

To understand this, we need to know what gravity is.

Something seems to hold us down on the ground. It makes...

Read more

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