Mastodawn

How is the Moon 🌙 1% of Earth’s 🌏 mass, but its #gravity is 17% of Earth’s ? https://www.astronomy.com/science/how-are-mass-and-gravity-correlated/

The moon's density is 3.34 grams per cubic centimeter (3.34 g/cm3). That is about 60% 📊 of Earth's density https://www.space.com/18135-how-big-is-the-moon.html

#astrophysics #SurfaceGravity #Newton

How is the Moon 1% of Earth’s mass, but its gravity is 17% of Earth’s?

When it comes to surface gravity, mass does matter, but so, too, does size. This means the Moon can punch above its mass.

Astronomy Magazine

Soh Kam Yung Apr 15, 2021

So cool. These brown dwarfs are spinning so fast, gravity at their equator feels almost like on Earth, while at the poles it's over 100g!

https://www.syfy.com/syfywire/if-these-brown-dwarfs-spun-much-faster-theyd-tear-themselves-apart

Hal Clement would have loved this [ https://en.wikipedia.org/wiki/Mission_of_Gravity ].

#BrownDwarfs #SurfaceGravity

If these brown dwarfs spun much faster they'd tear themselves apart

Astronomers have found three brown dwarfs — objects more massive than planets but less so than stars — that are the most rapidly rotating of any known. These beasts spin so dizzyingly fast they rotate about once per hour. That's phenomenal. Think of it this way: They are about the same size as Jupiter, but that giant planet in our solar system spins once every ten hours. These objects spin ten times faster.