Jonathan McDowell is retiring from studying the universe. But he’s ramping up efforts to chronicle humanity’s exploration of space.

© Tony Luong for The New York Times

A new estimate of the ghostly particle’s maximum possible mass brings physicists a tad closer to understanding the universe.

© Uwe Anspach/picture alliance, via Getty Images

Using samples gathered from the Chang’e-6 mission, scientists found that the interior of the moon on the half we never see from Earth might be drier than the near side.

© CNSA, via EPA, via Shutterstock

It’s the most energetic particle of its kind ever discovered, and scientists have no idea where it came from.

President Trump’s executive order is altering scientific exploration across a broad swath of fields, even beyond government agencies, researchers say.

Alexandra Bell is bringing more than a decade of experience in nuclear policy to the Bulletin of the Atomic Scientists, the organization that sets the Doomsday Clock.

On Monday night you may have a chance to witness the moon obscuring the Red Planet at its brightest, as well as a comet’s closest approach to the sun.

The Quadrantids might be one of the strongest showers this year, but poor weather could make them difficult to see.

The probe sent a signal to Earth indicating that it had survived the closest solar encounter ever attempted by a spacecraft.

Experts said they were “blind” to the Indian Ocean tsunami in 2004. Twenty years later, working toward a world without tsunami deaths is a challenge.