Could Freon in the atmosphere of a distant planet be the thing that finally confirms humankind is not alone?
An astrophysicist says extraterrestrial civilizations “almost certainly” existed at one time or another. Here’s what’s wrong with his argument.
Yuri Milner is spending $100 million on a probe that could travel to Alpha Centauri within a generation—and he's recruited Mark Zuckerberg and Stephen Hawking to help. In an interview with The Atlantic, Milner makes his case for star travel.
Bob Ebeling, the engineer who foresaw the Challenger disaster, and lived with guilt for decades, has died.
To know the Earth’s future, you must first know its past.
What went unsaid in last night’s debate.
A behind-the-scenes look at the NASA telescope that will search for signs of life on distant planets
Time is running out on the agency’s most ambitious science mission in generations, and that means no stopping for anything—not even a historic blizzard.
Astronomers think they may have found a “super earth” lurking in the outer solar system.
We recently published an article naming Jupiter “the best planet.” As everyone knows, Saturn is the best planet. We regret the error.
Saturn, not Jupiter, is the best planet.
Staff picks of our favorite science, technology, and health stories from 2015
To solve climate change, we need to reimagine our entire relationship to the nonhuman world.
Hiding in the dense center of our galaxy are stars that formed just after the Big Bang. Here's how astronomers found them.
Get ready to start hearing a lot more about geoengineering.
Peering through a wrinkle in spacetime, astronomers have just seen the first galaxies.
Astronomers have spotted a strange mess of objects whirling around a distant star. Scientists who search for extraterrestrial civilizations are scrambling to get a closer look.
A six-month investigation found a decade of sexual-harassment complaints against famous astronomer Geoff Marcy to be credible.
The strange beauty of paleo art
The Search for Extraterrestrial Intelligence is newly flush with cash—and ambition.