Astronomers announced the discovery of a starless cloud of hydrogen gas, a pristine relic of the cosmos that is almost as old as time itself.

Nearly everything in the universe is made of mysterious dark matter and dark energy, yet we can’t see either of them directly ...

A NASA team using the Hubble Space Telescope found an object in space never recorded before, nicknamed “Cloud-9.” ...

Mars, often depicted as a barren red planet, is far from lifeless. With its thin atmosphere and dusty surface, it is an ...

They're called ghost particles for a reason. They're everywhere—trillions of them constantly stream through everything: our ...