Nell Greenfieldboyce

NASA is getting ready to give an asteroid a little push, in a test intended to ready Earth's defenses against a potential asteroid approach.

NASA aims to make history Monday by ramming a spacecraft into an asteroid - to deflect its trajectory. The test is meant to defend against possible future asteroids on a collision course with earth.

For a second time, NASA has scrubbed the launch of its new moon rocket. Problems with fuel leaks and faulty sensors led to the delays for the Artemis-1 test mission, with more possible delays to come.

A recurring leak of liquid hydrogen fuel forced NASA on Saturday to postpone a scheduled launch for the second time this week. The earliest possible launch date is Sept. 19.

NASA scrubbed its Artemis I test flight to the moon due to engine issues but will try again Friday. The flight is uncrewed but NASA hopes to send people back to the moon on future flights.

NASA plans to test launch its newest rocket — one it hopes will eventually take astronauts back to the moon. But the rocket's big price tag has some critics skeptical about its future.

Monday, NASA plans to launch a new rocket and capsule to the moon. If all goes well, the next mission will send people back to lunar orbit for the first time in 50 years.

NASA plans to test launch its newest rocket next week — one it hopes will eventually take astronauts back to the moon. But the rocket's big price tag has some critics skeptical about its future.

Humans' ability to sweat is useful on Earth — but when people go up into space, they find that perspiring in zero gravity presents some unique challenges.

A 30-year, nationwide study of ecological changes — including the effects of climate warming — has been releasing a powerful greenhouse gas, and critics want it to stop.

In the week since the first images from the James Webb Space Telescope were unveiled, astronomers have been poring through all the observations it's made so far--and they're happily overwhelmed.

In the week since the first James Webb Space Telescope images were unveiled, astronomers have been poring over all its observations so far. What they've seen has them giddy.

The largest bacteria known to science have been discovered in the Caribbean. They're visible to the naked eye and surprisingly complex.

An isolated population of polar bears in southeast Greenland has learned to hunt on freshwater glacier ice. That means they may be able to survive longer as climate change makes sea ice scarce.

The amount of resources devoted to studying gun violence is paltry compared to its public health impact. Still the evidence shows certain policies might help prevent mass shootings.

An image of what looks like a glowing orange donut is actually the first picture of the supermassive black hole at the center of the Milky Way, our home galaxy.

The first ever image of the black hole at the center of our galaxy has been released by scientists, who say it shows Albert Einstein was right about gravity.

The CDC reports a historic increase in firearm deaths. During the pandemic, there has been a 35% increase in the firearm homicide rate, and suicides by firearm also are persistently high.

The rate of U.S. gun homicides jumped nearly 35% in 2020 to the highest level in more than 25 years. And gaps widened for groups already at the highest risk, especially Black men and boys.

NASA and the European Space Agency are gearing up to bring home a pristine sample of Martian rock. But given the small chance of life on the red planet, they have to grapple with safety questions.