Scientists using NASA’s Mars-orbiting MAVEN spacecraft discovered a mysterious cloud of dust hundreds of miles above the planet’s surface -- and no explanation for how it got there.
A dwarf galaxy orbiting the Milky Way is humming with gamma rays, leading astronomers to hypothesize that it could be filled with annihilating dark matter particles.
As NASA's Dawn mission slowly spirals in on its dwarf planet target, Ceres' alien landscape is becoming sharper by the day.
It has long been assumed that the size of a supermassive black hole in a galaxy's core is intimately related to the number of stars that galaxy contains -- but it might not be that simple.
Amateur astronomers gazing at Mars discovered gigantic plumes soaring more than 125 miles above the planet’s surface, a phenomenon that so far defies explanation.
A strange, flickering white blotch found on the dwarf planet Ceres by a NASA spacecraft has scientists scratching their heads.
Giant bubbles of gas that erupted from the core of the Milky Way galaxy millions of years ago are expanding out into space at mind-blowing speeds, according to new observations that may help reveal how the strange balloon-like lobes formed.
A new study suggests that at least two more planets are circling the sun far beyond Pluto’s orbit.
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