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A blog about where planets come from and where they are going

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Can moons orbit moons? — the poem

January 23, 2019

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

5 Comments Can moons orbit moons? — the poem

Can moons have moons?

October 9, 2018

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?

32 Comments Can moons have moons?

Real-life Sci-Fi World 14: A horseshoe planetary system

July 2, 2018

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

9 Comments Real-life Sci-Fi World 14: A horseshoe planetary system

The Million Earth Solar System

June 1, 2018

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

42 Comments The Million Earth Solar System

Is Pluto a mega-comet?

May 31, 2018

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?

5 Comments Is Pluto a mega-comet?

The Black Hole Ultimate Solar System

May 30, 2018

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

17 Comments The Black Hole Ultimate Solar System

The MOJO videos

May 30, 2018

One fine week in May, well, I needed some peace
I packed up my bags and I headed to Nice… … More The MOJO videos

9 Comments The MOJO videos

Mars’ growth stunted!

May 29, 2018

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!

27 Comments Mars’ growth stunted!

The Black Hole Solar System

May 28, 2018

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

17 Comments The Black Hole Solar System

Asimov’s Kalgash: a planet in permanent daytime (for real this time!)

March 21, 2018

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!)

56 Comments Asimov’s Kalgash: a planet in permanent daytime (for real this time!)

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