A first-of its-kind space weather "tabletop" exercise has revealed major weaknesses in America's preparedness for severe ...

Quasars represent some of the most luminous and energetic phenomena in the universe. These distant powerhouses are driven by ...

Earth's atmosphere pulses in sync with the sun's fiery outbursts, indicating it is more sensitive to solar activity than previously thought, according to new research.

A team of astronomers believes they may have spotted a serious candidate for a ninth planet in our Solar System. This object, ...

The Keck Observatory and NASA’s Hubble Space Telescope may have uncovered a "potential three-body system in the Kuiper Belt," ...

From solar probes to deep space missions, these record-breaking human-made objects reached speeds that make bullets and jets ...