Newsletter

Latest letters

One discovery each Sunday, and the steps that led to it.

Desert dunes and ridges at first light.

Finding planets around other stars

How a tiny dip in a star's light, measured night after night, became the way we find new worlds.

Nov 8, 2026 · 9 min read

Why the galaxies are moving away
Nov 1, 2026 · 10 min read
Neptune, found with a pencil
Oct 25, 2026 · 8 min read
The stars that blink like lighthouses
Oct 18, 2026 · 9 min read
What the stars are made of
Oct 11, 2026 · 8 min read
Kepler and the shape of an orbit
Oct 4, 2026 · 7 min read

Measuring the distance to a star
Oct 17, 2026 · 8 min read
Dark lines in the Sun's light
Oct 10, 2026 · 7 min read
How a prism splits light
Oct 3, 2026 · 6 min read
The first telescopes, and what they showed
Sep 26, 2026 · 8 min read
Why the planets seemed to wander
Sep 19, 2026 · 7 min read
What the ancient sky watchers could see
Sep 12, 2026 · 6 min read

Free

Because

A short letter every Sunday: one discovery about the sky, and the steps that led to it.

2026-11-05
Finding planets around other stars
2026-11-04
Why the galaxies are moving away
2026-11-03
Neptune, found with a pencil
2026-11-02
The stars that blink like lighthouses