Katia Moskvitch

Scientists hope that in just a few months they may get a confirmation of whether accelerated expansion of the universe did indeed take place in the first fleeting moments after the Big Bang.

Moon-forming giant impact caused a giant magma ocean on Earth; life appeared millions of years later, hitching a ride on a Martian rock, a scientist says.

The young moon may have been a magma "mush" for hundreds of millions of years before it solidified, a scientist says.

In order to truly answer the unsolved mysteries of the moon's origin, new missions to retrieve samples of the lunar surface and return them to Earth will be needed, one scientist said.

Just like the moon, Mercury is a desolate, rocky and airless body, albeit a bit bigger than Earth's satellite, said Sean Solomon, the principal investigator for NASA's Messenger mission to Mercury.

Is the moon a present from Venus, which once had a moon and then lost it? A wild new theory puts the scenario out there.

Quantum effects spill out of physics labs and into wet and messy biological systems.

The ultraprecise ticker could be used to prove Einstein's general relativity and create more precise GPS systems.

The faraway star cluster NGC 6496 is 10.5 billion years old and 32,600 light-years away.