Gravity
Why Do We Have Tides?
Tides
![](/sites/default/files/waves.jpg)
Credit: Ron Porter @ Pixabay.com
The level of the sea rises and falls about two times each day. We call these changes tides.
Gravity
![](/sites/default/files/astro/zeroG_0.jpg)
Credit: Steve Jurvetson
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In partnership with the Faulkes Telescope Project