Researchers found that humans contribute far less nitrogen to the open ocean than previously thought.
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Quake or Bomb? Seismic Waves Speak Truth, Even If Nations Don't
When the Earth rumbles and no one knows why, seismologists can analyze the seismic event's waveforms to determine whether a hidden explosion or an earthquake caused the shaking.
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Icebergs Fertilize Southern Ocean, Sequester Carbon
Huge, drifting ice rafts (the white spot on the satellite image below ) shed minerals as they melt, painting trails of nutrients, teeming phytoplankton, and chlorophyll across hundreds of kilometers of ocean.
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Obama Says Combating Climate Change Aids Earth and U.S. Economy
In his seventh and final State of the Union address, President Obama touts alternative-energy gains during his tenure, urges a quicker shift from fossil fuels, and mocks climate change skeptics.
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What Caused the Sudden Heating of Uranus's Atmosphere?
A recently observed temperature reversal on Uranus may offer a clue to a long-standing mystery: Why are the upper atmospheres of gas giants so hot?
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New NOVA TV Show Explores Coevolution of Rocks and Life
Mineralogist Robert Hazen and other scientists probe connections between living organisms and rocks in "Life's Rocky Start," which premieres tonight on PBS stations around the United States.
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Claudia Joan Alexander (1959–2015)
Alexander is remembered for her leading role in the Galileo and Rosetta missions and her efforts to encourage women scientists from underprivileged and underrepresented groups.
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Ancient Start of Animal Evolution Wasn't Delayed by Low Oxygen
New research finds that Earth had sufficient oxygen 1.4 billion years ago for animals to evolve. Therefore, low oxygen levels probably didn't hold back evolution, as scientists have long thought.
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New Step Toward Finding Earth 2.0
Researchers unveil a way to tease out the wobble of a star caused by unseen planets despite the confounding effects of star spots, which are the sunspots of distant stars.
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Special Delivery: Post Office to Issue Space-Themed Stamps
Letter writers will be able to adorn their envelopes this year with full-disk images of the planets, Pluto, and the full Moon, as well as Star Trek icons.