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Science and Astronomy

How to Learn Physics for Free - 2026 Edition
A guide for the curious
 • Alastair Williams
The Bold Insanity of Artemis II: America Prepares to Return to the Moon
On the second flight of America's Return to the Moon
 • Alastair Williams
The Debris of Creation: Hubble Watches Worlds Collide
On the discovery of violent collisions around Fomalhaut
 • Alastair Williams
Project Mercury and the SOFAR Bomb
Why bombs were hidden on the first space capsules
 • Alastair Williams
Notes On Learning Hard Things
Reflections on the art of studying physics
 • Alastair Williams
The Biggest Solar Flare of 2025
A flare hits Earth. But when will a really big one come?
 • Alastair Williams
How Many Alien Civilizations Exist In Our Galaxy?
On the equations and odds of alien intelligence
 • Alastair Williams
The Hasselblad Cameras of Project Mercury
On the beginning of NASA's long relationship with Hasselblad cameras
 • Alastair Williams
The Myth and Mystery of The Tunguska Impact
What was it that exploded over Siberia in 1908?
 • Alastair Williams
On Progress and Revolution in Physics
Thoughts on the nature of science
 • Alastair Williams
Was There Life on Mars?
A rover on the Red Planet stumbles across an intriguing hint of a long gone world
 • Alastair Williams
The Mysterious Origins of the Third Interstellar Comet
The latest interstellar comet probably isn't an alien spaceship. But that doesn't mean we know where it really came from.
 • Alastair Williams
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