Estimates of how fast the universe is expanding disagree. Could a new form of dark energy resolve the problem?

Coverage of the launch is expected to begin at 11 a.m. ET and will be added to this story in the video player above. The ...

The Hubble Space Telescope has seen Jupiter's Great Red Spot oscillating in width as it drifts around the planet. Could this ...

Scientists identify faint black holes in galaxies that formed during the early days of the universe, using imagery from the ...

NASA's Chandra X-ray space telescope has spotted the cosmic serial killer that, like Michael Myers, is back for a sequel, ...

NASA’s Europa Clipper, the largest robotic probe the agency has ever built, rocketed into space Monday on a mission to ...

NASA's Europa Clipper spacecraft lifted off Monday from Kennedy Space Center in Florida aboard a SpaceX Falcon Heavy rocket, ...

A spacecraft that will hunt for signs of alien life on one of Jupiter’s icy moons has blasted off from Cape Canaveral, ...

A massive NASA spacecraft is ready to set sail for Jupiter and its moon Europa. The craft named Europa Clipper will peer ...

A NASA probe, the length of a basketball court, is headed to the tantalizing world Europa. The Europa Clipper craft ...

A pair of quasars that existed when the universe was only 3 billion years old has been spotted by the Hubble Space Telescope.