An artist’s impression of a star system, UPM J1040−3551, against the backdrop of the Milky Way as observed by Gaia, provided by Jiaxin...

A rear-facing image provided by NASA/JPL-Caltech/MSSS from the Perseverance Mars rover as it drives up toward the rim of the planet’s...

In an undated rendering from NASA, a concept image of a lunar surface nuclear reactor. Sean Duffy, the acting administrator of NASA, has...

In an undated image provided by Tobias Wilhelm/State Museum of Natural History Stuttgart, an artist’s reconstruction of Mirasaura, which...

A frame from a video provided by Nadine Holmes shows an ocelot and an opossum together in the Amazon. Scientists are trying to understand...

John Christy, an atmospheric scientist who doubts that human activity has caused global warming, in 2014. The Energy Department has hired...

In an undated image provided by David Rankin/Saguaro Observatory, A11pl3Z captured by David Rankin, an engineer at the Catalina Sky...

To Dave Ebert, a shark scientist at San Jose State University, the movie brought sharks out of the shadows, where they had been...