NASA's Hubble Space Telescope has seen planet-size cannonballs of hot gas whipping past a dying star, but the origin of these plasma balls remains a mystery.

The solar wind's evolution is finally coming to light, thanks to new analysis of observations from NASA's Solar Terrestrial Relations Observatory (STEREO).

A sped-up video of Earth spinning through space shows a dizzying array of clouds and continents from a satellite located 1 million miles away.

NASA's Solar Probe Plus mission is moving ahead with its daring 2018 launch to study the sun's super-heated atmosphere.

Just in time for the new "Star Trek" movie arrival in theaters this weekend, the Hubble Space Telescope released its latest image from its "Frontier Fields" program.

Alien life may not live by our rules, and it's time we appreciate that as we look to the stars for signs of alien biology.

Was there a so-called 'super-Earth' planet that formed inside the orbit of Mercury? If so, it might have been eaten by our sun.

For the first time, scientists have seen the shock wave emanating from an exploding star in visible light.

This week, a total solar eclipse will put on a dramatic celestial show, darkening the skies over Southeast Asia in what will be the only total eclipse of the sun this year.

An incredible new picture of the Milky Way shows our home galaxy glowing eerily in wavelengths invisible to the human eye, revealing zones of hidden star birth.

There is no substance to multiple media reports that an asteroid passing by Earth will cause earthquakes on our own planet, according to asteroid experts at NASA's Jet Propulsion Laboratory.

How, exactly, were scientists able to prove that briny water can be found on Mars?

A spectacular rock arch in Utah is safe from collapse for now, according to a study that used a new technique to listen to the arch's natural "hum" to measure its internal health.