Astronomy
How Mariner 4 Rewrote What We Know About Mars
It killed the dreams of science-fiction fans, but kick-started decades of Martian exploration
When Galaxies Clash
Is a new image of star systems colliding a vision of our Milky Way’s future?
The Loving Embrace of the Milky Way
Researchers have discovered that our galaxy’s outermost spiral arms are wide open and farther away than we thought
See Some of the Best Astronomy Photos of the Last Year
From Earth to the moon to deep space—and back again
Cosmic Shockwave Reshaped a Newly Discovered “Bow and Arrow” Galaxy
The discovery was made by a citizen scientist
The New Seismic Discovery Beneath the Surface of Mars
Earth isn’t alone—in its rock recycling processes
James Webb Space Telescope Captures the Cigar Galaxy’s Brilliant Stellar Halo in Pristine Detail
The newly released images offer hints into the galaxy’s turbulent past
Perseverance Scratches the Martian Surface, Finds Organic Carbon
Another hint life may have existed on the red planet
See the Milky Way’s Galactic Bulge, Captured in Unprecedented Detail
60 million stars never looked so good
Take a Gander at an Ancient Supernova in the Heart of the Milky Way
The remnants of a star that exploded 1,700 years ago
How to Stop a Killer Asteroid
From high-speed battering rams to gravity tractors, the technology exists to protect the planet. The question is whether humanity will act in time—and in concert.
