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The Astroholic Explains S01E08 – Spin, Stardust, and… Is Chris a Cucumber?

6 Dec 2019, 20:26 UTC
The Astroholic Explains S01E08 – Spin, Stardust, and… Is Chris a Cucumber?
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In this episode we tackle two more questions from our lovely listeners. The first is about what determines the rotation of planets and the second one focuses on the matter at hand: are we really made from stardust?
Listen on Apple Podcast or on your favourite podcast app through Anchor.

Chris
Welcome to the Astroholic explains. I’m your host, Chris
Alfredo
And I’m Alfredo, The Astroholic.
Chris
This is a podcast where I throw some cosmic conundrums your way,
Alfredo
And I try my best to answer them. Let’s get started!
Chris
This question comes from Richard Lewis, who asks, with respect to the rotation of a planet, what determines its speed? How come Mercury has a longer day than Earth despite being smaller? And then he also adds “likely a stupid question, but I’m curious”
Alfredo
No, not a stupid question at all! Let’s do it!
Chris
So what is it?
Alfredo
It’s about the conservation of angular momentum. So, this is a property of the universal property of physics in which things that are rotating, if there is no friction or anything stopping them, they will continue to rotate with the same rotational speed. So what happens? For ...

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