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Bigger than T. rex, this dinosaur hunted in water
Spinosaurus was the largest known predatory dinosaur to roam the Earth. Scientists now say that it was also the first truly semiaquatic dinosaur.
September 15, 2014
New report detects substantial rise in greenhouse gases
The most recent rise in carbon dioxide is the largest annual change seen for this gas since 1984.
September 15, 2014
ESA announces landing site on Rosetta’s comet
Rosetta spacecraft has been moving in tandem with its comet since August. On Monday, ESA announced the site of a November landing.
September 15, 2014
Mars moon Phobos in front of sun on August 8
The Curiosity rover on the floor of the Gale Crater caught this image of Mars' larger moon Phobos passing in front of the sun on August 8, 2014.
September 15, 2014
Anticrepuscular rays in a Texas sky
Next time you see crepuscular rays extending from a sunset … turn around. Look opposite the the sun. You might catch a glimpse of elusive anticrepuscular rays.
September 14, 2014
Favorite photos of September 12 aurora
Two powerful storms on the sun this week resulted in beautiful displays of the aurora borealis, or northern lights, that dipped down as far as the northern U.S.
September 13, 2014
New scans reveal hidden monuments of Stonehenge
The startling results of a new survey include 17 previously unknown monuments and dozens of burial mounds surrounding Stonehenge.
September 12, 2014
First evidence for water-ice clouds outside our solar system
The first evidence for water-ice clouds on an object beyond our solar system. It's a brown dwarf, one of our closest neighbors, only 7 light-years away.
September 12, 2014
Significant auroras predicted for tonight
Reports from NOAA and elsewhere predict a chance of significant auroras, possibly observable as far south as the northern U.S. and maybe even farther south.
September 12, 2014
Video: Jellyfish flame on the ISS
Fire in space doesn't act like fire here on Earth. Untethered by gravity, flames in space curl themselves into tiny balls.
September 11, 2014
