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We all learn that the tides are caused by the Moon pulling on the Earth's oceans. So how come there's two high tides per day but we only have one Moon?

00:00 - Introduction
00:35 - One Moon, Two High Tides?
00:54 - Is it the Sun?
01:07 - Spring Tides
01:16 - Neap Tides
01:42 - The Earth-Moon Barycentre (centre of mass)
02:45 - Planetary wobbles
03:09 - Detecting exoplanets with star wobbles
03:20 - Wobbles create centrifugal force
04:29 - A lunar day of 24h50m
04:56 - Brilliant
06:06 - Bloopers

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📚 My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): [ Ссылка ]
📚 Note, USA & Canada hardback out 1st November 2022

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👕 My new merch is available here (with worldwide shipping!): [ Ссылка ]

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🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive

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👩🏽‍💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.

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