This composite image contains X-ray data from Chandra (green and blue) that show heated material in the center of a shell generated by a supernova explosion. Optical data from Hubble show the glowing pink rim, which is ambient gas being shocked by the blast wave from the supernova, as well as the surrounding star field. The Type Ia supernova that resulted in the creation of this remnant would have been visible from Earth some 400 years ago.

How Stars Die

Nothing in this Universe is eternal—not even the stars.
How Mars may have looked about four billion years ago

How Mars Lost Its Magnetic Field—and Then Its Oceans

Chemical changes inside Mars's core caused it to lose its magnetic field. This, in turn, caused it to lose its oceans. But how?
Aerial view of Barringer crater in Arizona

The Eight Best Hidden Impact Craters on Earth

Many impact craters on Earth have been erased thanks to wind, water, and plate tectonics. But scientists have clever ways to find them.
Plate Tectonics Diagram

How Plate Tectonics Shook Life into Existence

The cycles of life all rely on the dynamism of the Earth’s crust.
A street dog in Varanasi city, India

How Street Dogs Spend their Days

Generally lazy, often friendly, the dogs of India know how to relax.
Indian migrant workers walk on a bridge after they were stopped by police while returning to their native places, as the country relaxed its lockdown restriction on May 14, 2020 in New Delhi, India

India’s Coronavirus Migration Crisis

Widespread market failure and unemployment triggered by the coronavirus pandemic have set off a crisis of domestic migration in India.
Nikolai Vavilov in prison

The Weed Scientist Who Brought Down the Wrath of Stalin

Nikolai Ivanovich Vavilov's hypothesis on the evolution of rye is now accepted. But in the 1930s, his research got him arrested.
Francesca Vidotto

Francesca Vidotto: The Quantum Properties of Space-Time

Theoretical physicist Francesca Vidotto on feminist epistemology, white holes, string theory, and her book (with Carlo Rovelli) on loop quantum gravity.
Gif og a woman alseep on a white sheet with clocks blinking in and out of sight

What Is Chronobiology?

Does it explain why we’re having so much trouble sleeping?