The Universe

According to new simulations, many, even most, planets get ejected from their star early in their history

Evidence of alien worlds goes back farther than you think

Defining the word “moon” is harder than you might think

In colorful photographs of galaxies, stars, planets, and more, what you see isn’t necessarily what you get

The March 13–14 lunar eclipse will be an all-night affair you won’t want to miss

Whether aliens could detect our modern civilization depends on what signs they’re looking for—and, crucially, their distance from us

With radio and infrared telescopes, astronomers can pierce the dusty veil of our galaxy and map its farthest reaches

It’s neither fast nor food, but a spectacular object called HH 30 looks appetizing for astronomers in a new image from the James Webb Space Telescope

“Keep your eye on the ball” is a motto for many athletes—and for astronomers trying to find Earth-threatening space rocks

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define

This year, from Earth’s perspective, Saturn’s rings will appear nearly edge on, making them almost invisible

A little-known chapter of the Hubble Space Telescope’s history is a reminder of the risks of looking at the sun