Researchers using data from the James Webb Space Telescope recently announced they had detected biosignature gases on planet K2-18b. A new analysis of the same data casts doubt on the earlier findings

The pre-dawn sky will feature a glowing crescent moon, joined by planets Mercury, Venus and Saturn.

Experts are divided whether a new missile defense system for the U.S., inspired by Israel's Iron Dome, would be worth the cost.

The James Webb Space Telescope may have detected life-associated gas in the atmosphere of a far-off planet. The news is being greeted with both enthusiasm and skepticism.

The Lyrid meteor shower will reach a peak later this month, but stargazers can catch a first glimpse beginning Wednesday night.

Monday's 11-minute flight featured the first all-female crew since 1963. Here's what else to know about it.

On April 14, Blue Origin plans to launch a space flight with a crew that includes the singer behind the 2010 hit "Firework." But we can think of many other artists who deserve to be among the stars.

SpaceX launched four people into space Monday evening on a first-ever human mission to orbit Earth's polar regions. If successful, the mission also will be the first to cultivate mushrooms as a crop.

The partial solar eclipse will be visible in various locations in the U.S. Northeast.

In deference to President Trump's anti-DEI order, the space agency has removed a promise to send the "the first woman, first person of color" to walk on the moon aboard the Artemis III mission.

The Dark Energy Spectroscopic Instrument (DESI) is studying dark energy and the accelerated expansion of the universe.

If our 13.8 billion-year-old cosmos could be considered middle-aged, researchers note these new images captured around its 380,000th birthday represent a snapshot of the universe as a newborn.

Astronauts face several risks during spaceflight, including exposure to radiation.

NASA astronauts Suni Williams and Butch Wilmore were on the International Space Station more than nine months, despite launching into space in June for what was expected to be an eight-day mission.

Suni Williams and Butch Wilmore were only supposed to be in space for about a week when they launched in June, but problems with their Boeing Starliner spacecraft extended their journey for months.