A galaxy made almost entirely of dark matter, an elusive form of matter that doesn’t interact with light, was spotted by ...

For this month's ESA/Hubble Picture of the Month, NASA/ESA's Hubble Space Telescope is joined by ESA's Euclid to create a new ...

A team of scientists says it's possible to use tiny ripples in space and time, or gravitational waves, to measure the rate at ...

A subtle gravitational-wave “hum” from merging black holes may help settle the cosmic fight over how fast the universe is ...

Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

There have been plenty of attempts to resolve the "Hubble Tension" in cosmology. This feature describes how one of the most ...

NASA's Hubble telescope has circled our planet in a low-Earth orbit for decades. But how much longer has become increasingly ...

In late February, people in the Northern Hemisphere can look up for a special sight: six planets will all be visible from ...

Can NASA and Elon Musk get us to Mars and beyond?

Whether purchased by space enthusiasts, stamp collectors or casual letter writers, these stamps bring the wonders of the ...

Forty million years ago, a star in a nearby galaxy exploded, spewing material across space and generating a brilliant beacon ...

NASA's Double Asteroid Redirection Test (DART) impacted the 'moonlet' Dimorphos in the Didymos asteroid system. NASA's Hubble ...