A global team of vigilant satellite watchers has caught the U.S. Air Force's robotic X-37B space plane on camera as the craft circles Earth on its fourth mysterious mission.
Astronomers may have solved the decades-long cosmic murder mystery of what kills most galaxies in the universe: They are strangled to death, so they can no longer create new stars.
Astronomers have found a quartet of quasars embedded in a single cloud of cold gas, a discovery that challenges currently held theories about how these rare objects form.
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.
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.
Obsidian tools tell a different story than the theory that the Rapa Nui civilization collapsed all at once amid mass starvation.
A young boy is claimed to have lived a past life as a Marine killed in combat, though psychology can likely explain this mystery.
Giant gypsum crystals -- some of which are in excess of 30 feet long and half a million years old -- are found deep within the Naica mine in Chihuahua, Mexico and are renowned for their spectacular beauty.
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