Physics Gravitational waves produce a background hum across the whole universe After decades of searching, astronomers have found a distinctive pattern of light, from spinning stars called pulsars ...

When it comes to dramatic and awe-inspiring pictures of space, few can contend with what appears to be a pic of, well, nothing at all: a fascinating image of what seems to be a hole in the fabric of ...

If a planet-killer asteroid was more than five years away from entering Earth's gravitational keyhole, sending two scouts and a projectile would be the way to go, the MIT researchers concluded.

After considering the effect of the gravitational keyhole on Apophis 99942, the space agency concluded that the asteroid only has a small chance of hitting Earth.

Gravitational waves may leave indelible marks on spacetime—and could help us solve the black hole information paradox.

The detection of gravitational waves is the final confirmation of Einstein’s theory of general relativity, and opens up a new window into the cosmos.

Colliding black holes send ripples through spacetime that can be detected here on Earth. What are these gravitational waves, and how did Advanced LIGO detect them?

Astronomers have directly detected elusive gravitational waves, 100 years after the existence of these spacetime ripples was first proposed by Albert Einstein in his theory of general relativity ...

Five myths about gravitational waves Published: September 4, 2015 12:55pm EDT Elegant but elusive. Simulation of merging black holes showing gravitational waves. NASA/ESA/wikimedia ...

The gravitational keyhole they mention is a precise region in space, only slightly larger than the asteroid itself, in which the effect of Earth's gravity is such that it could tweak Apophis' path.