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Gravity

Black Holes

The Black Hole at the centre of M87 — The Black Hole at the centre of Messier 87
Image from the EHT Consortium/ESO

Why Do We Have Tides?

Stage 1

Tides

Waves coming towards the shore.
Credit: Ron Porter @ Pixabay.com

The level of the sea rises and falls about two times each day. We call these changes tides.

Gravity

Experiencing micro-gravity on a NASA plane.
Credit: Steve Jurvetson

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