Can moons orbit moons? wondered Juna and I.
Some planets have moons, you know, up in the sky
But none of those moons has its own moon around it.
When Juna’s son learned this he just was astounded! … More Can moons orbit moons? — the poem
Planets orbit stars. Moons orbit planets. But no moons have their own moons (let’s call them submoons). Why is that? … More Can moons have moons?
One star. Two planets share an orbit, with one following a horseshoe-shaped path around the other. Boom! … More Real-life Sci-Fi World 14: A horseshoe planetary system
Welcome to what might very well be the culmination of the Building the Ultimate Solar System series. Teaser: the system built in this post could also be called the Ultimate Engineered Black Hole Eyeball Ringworld Solar System (if you’re really not into the whole brevity thing). Our Solar System has one habitable planet. A few … More The Million Earth Solar System
Short answer: Well sort of, but it’s more useful to think of it as being built from the same stuff as comets. Like an Uncle of the comets. Read on for an explanation. Earlier this week my wife mentioned a headline she saw. “Pluto is a giant comet? Whoa!” It was all over the place: … More Is Pluto a mega-comet?
What happens when the central body in a planetary system is replaced with a million-Sun black hole? … More The Black Hole Ultimate Solar System
One fine week in May, well, I needed some peace
I packed up my bags and I headed to Nice… … More The MOJO videos
Mars is a weirdo. (Well, as far as planets go). Why is it so small (just 11% as massive as Earth)? … More Mars’ growth stunted!
Planets are kind of my thing. But black holes are awesome too. I mean, they can just suck you right in… (I will never apologize for my bad jokes!) I want to bring black holes and planets together. In this post, I’ll first introduce black holes. Then we’ll build the Black Hole Solar System. In … More The Black Hole Solar System
Let’s find out what it takes to build a system in which a planet remains in perpetual daylight, except for once every few thousand years…. … More Asimov’s Kalgash: a planet in permanent daytime (for real this time!)
