Scientists are grappling with a cosmic mystery: why does the Universe behave differently on massive scales compared to our ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically ...

Rather than slowly condensing over millions of years, the first building blocks of Earth and other planets may have formed ...

The study says that large cosmological surveys like Euclid and DESI can provide hints of new physics by looking at billions ...

The interplanetary comet 3I/ATLAS is remarkably rich in a specific type of water that contains deuterium, meaning it came ...

Interstellar comet 3I/ATLAS is even more extreme. The ratio of semi-heavy water to regular water is 30 times larger than in ...

The sun is an incomprehensibly gigantic, constantly roiling nuclear furnace—but some days are even busier than others. Based ...

Scientists are exploring the possibility of a "fifth force" beyond the four known fundamental forces. This hypothetical force ...

The farthest spacecraft from Earth has shut down another instrument in the hopes of buying time for an upgrade that could ...

NASA has shut down a science instrument on the iconic Voyager 1 probe, the first spacecraft to reach interstellar space.

NPR's Scott Detrow talks with Regina Barber and Nell Greenfieldboyce about the Artemis moon missions, the "seismic quiet" during a solar eclipse, and the origins of a mysterious interstellar visitor.

A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated ...