Can moons have moons?
Planets orbit stars. Moons orbit planets. But no moons have their own moons (let’s call them submoons). Why is that?
Real-life Sci-Fi World 14: A horseshoe planetary system
One star. Two planets share an orbit, with one following a horseshoe-shaped path around the other. Boom!
The Million Earth Solar 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…
Is Pluto a mega-comet?
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:…
The Black Hole Ultimate Solar System
What happens when the central body in a planetary system is replaced with a million-Sun black hole?
The MOJO videos
One fine week in May, well, I needed some peace
I packed up my bags and I headed to Nice…
Mars’ growth stunted!
Mars is a weirdo. (Well, as far as planets go). Why is it so small (just 11% as massive as Earth)?
