Total solar eclipse, May 29, 1919, at Sobral, Brazil

Total Solar Eclipse, 2024 Edition

A total solar eclipse crosses North America on Monday, April 8. Be prepared!
Astronomical diagram of the seasons and signs of the zodiac, c. 1860

Earth Isn’t the Only Planet With Seasons

But they can look wildly different on other worlds.
Artist's impression of ʻOumuamua

Why Interstellar Objects Like ʻOumuamua and Borisov May Hold Clues to Exoplanets

The detection of two celestial interlopers careening through our solar system has scientists eagerly anticipating more.
Andromeda Galaxy

100 Years after the “Great Debate”: How Edwin Hubble Expanded the Cosmos

In 1924, Edwin Hubble found proof that the Milky Way isn't the only galaxy in the Universe.
A deep image from the Dark Energy Survey showing the field covered by one of the individual detectors in the Dark Energy Camera.

Astronomers Use AI to Shed Light on Dark Energy

A new measurement offers insights on the density of the mysterious force driving the Universe’s expansion.
An illustration of seven Earth-size planets orbiting the TRAPPIST-1 star

Why TRAPPIST-1 Is Our Favorite Alien Planetary System

The TRAPPIST-1 system is a treasure trove of possibilities and questions. Observations by JWST have just begun.
An artist's rendering of a black hole

Ancient Black Hole Challenges Our Understanding of the Early Universe

The Big Bang theory is not threatened, but astrophysicists have some explaining to do.
Adoration of the Magi with Saint Anthony Abbot

What was the Star of Bethlehem?

Never stop looking at the skies in wonder.
The Sun photographed at 304 angstroms by the Atmospheric Imaging Assembly (AIA 304) of NASA's Solar Dynamics Observatory (SDO)

How Earthquakes Helped Us Map the Interior of the Sun

Temperatures in the Sun's core exceed 10 million degrees Celsius. But how on Earth did we actually come to know that?