Dr. James O'Donoghue, Discover and Read the Best of Twitter Threads by @physicsJ

Dr. James O'Donoghue

I'm a planetary scientist with published papers specifically on Saturn's atmosphere/rings, so thought it'd be fun to rank the "Ringed Planet" emojisFirst I'm gonna assume they're trying to be SATURN

All planets can fit between the Earth & Moon When we say the distance is 405,500 km, we're talking about the center-to-center distance. The actual *space* between them is 397,385

Let's clear this up! In 1 Venusian year there are 1.92 Venus Solar days – a Solar day is the time taken to rotate relative to Sun (it's the common

Here are the planets with the only two mapped dwarf planets. Ceres [minor planet ID: 1] in the asteroid belt and Pluto [ID: 134340]. They're all tilted accurately and rotating

Here's what the Earth & Moon look like for a month from eachother This was reconstructed from real images, with night-side Earth made brighter / cloudless so you can see

"How long has the moonAnd earth been together like this?"—Earth formed 4.6 billion years ago and then a Mars-sized object hit 100 million years later. It was from the Saturn-ring

Space fact: despite Uranus having 14.5x more mass than Earth, you actually weigh 10% less on Uranus than you do on Earth. How? Uranus is spread out into a volume

Gas Giants like Jupiter barely contain any gashttps://twitter.com/SusannaLHarris/status/1289573954588250112 Their interiors are mostly made of liquid metallic hydrogen and hydrogen above the critical point... so Gas Giant isn't a really

Watch Jupiter's moon Ganymede eclipse the planet live in 4 hours on youtubehttps://www.youtube.com/watch?v=amlUJd2Tlt4&feature=youtu.be (hit set reminder)1) You'll see Jupiter in infrared live from a NASA telescope in hawaii2) T

Did you know planets don't technically orbit the Sun? Instead, everything orbits the Solar System center of mass, even the Sun! While the Sun contains 99.8% of the Solar System's

Planets and dwarf planets to scale in size, rotation speed, axial tilt and oblateness, numbered in order of distance from the Sun Axial tilts for each planet are found by

A Galactic Year is the time it takes our solar system to orbit the Milky Way. It takes ~230 million years to finish one and we actually undulate up and