Courses › The Universe from Scratch
10 short, free lessons, from Earth to black holes. No prior knowledge needed: every figure is measured, each one with its source, and whatever is an illustration is said out loud.
New lesson every Monday, Wednesday and Friday, from October 19 to November 9, 2026. Lessons are in Spanish.
From Earth to the Magellanic Clouds, with distances measured step by step.
▶ Monday, October 19 LESSON 2Why almost every drawing of the Solar System lies about the distances.
▶ Wednesday, October 21 LESSON 3Pluto, Sedna, Halley's Comet and the Oort Cloud, which no one has ever seen.
▶ Friday, October 23 LESSON 4Proxima Centauri, 4.25 light-years away, and its two confirmed planets.
▶ Monday, October 26 LESSON 5Seven Earth-sized planets, all closer to their star than Mercury is to the Sun.
▶ Wednesday, October 28 LESSON 6Kepler-16 b orbits two stars at once, like in the movies.
▶ Friday, October 30 LESSON 7What it really means for a planet to sit in the habitable zone.
▶ Monday, November 2 LESSON 8The Pleiades, Omega Centauri and the families of stars born together.
▶ Wednesday, November 4 LESSON 9The galaxy spins faster than its visible matter allows.
▶ Friday, November 6 LESSON 10Cygnus X-1, Sagittarius A*, M87* and the light that bends near a black hole.
▶ Monday, November 9