The Tully monster's classification has perplexed researchers since 1958.
The chance discovery is providing new insight into one of nature’s enduring puzzles.
Conspiracy theorists trying to decode abstract video clips in a mysterious, vanishing YouTube channel.
Powerful transient radio flashes in the universe pop off randomly and appear to defy explanation, but astronomers have made a breakthrough in pinpointing the exact source of one of these fast radio bursts.
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.
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