From dust to planetesimals

TL;DR: planetesimals are mountain-sized rocks (sometimes with ice) that grow from clumps of drifting dust (“pebbles”). The two types of meteorites come from planetesimals that formed in different parts of the Solar System and remained separate. … More From dust to planetesimals

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Cosmic fireworks!

Time for an astro-thought experiment. You belong to a super-advanced civilization with the ability to shape the cosmos as you wish. You can move around black holes, stars, planets, comets and moons (like the builders of the ultimate planetary systems). What would your civilization plan for big celebrations? What are their ‘fireworks’? What astronomical phenomena … More Cosmic fireworks!

Cohorts of stars orbiting black holes (with planets, moons, and eclipses!)

This post starts off with some world-building, jumps into eclipses and moons’ orbits, and finishes with a brand new Kalgash system that Isaac Asimov would be proud of (dropped into darkness every 2000 years!). More than one planet can share the same orbit around a star. This is not big news: the concept of Trojan … More Cohorts of stars orbiting black holes (with planets, moons, and eclipses!)