Astronomers spot a six-tailed asteroid
Neither comet nor a mythical beast, it might be an asteroid spinning apart.
Scott K. Johnson / Associate Writer
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Recent surface warming has probably been underestimated
Filling in data gaps with satellites makes the last few years a little warmer.
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Microscopic particles self-organize into a rolling mob
Don’t worry, they stop when we turn the current off.
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First evidence of invasive Asian carp reproducing in Great Lakes
Valiant efforts to keep them out may not have been enough for Lake Erie.
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Now Taking Requests
Ask Ars about the new IPCC report
Got a question about the climate? Let Ars do the digging.
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Geoengineering, through the eyes of the IPCC
What do we know about manipulating Earth’s climate?
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Reversing climate change even more difficult than it might sound
A thousand years might not be enough time to completely undo all the changes.
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How much warming does new IPCC report see in our future?
Understanding how the report's projections are generated and what they tell us.
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Are partisan news sources polarizing Americans?
Ars reviews the new book Changing Minds or Changing Channels.
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CERN CLOUD experiment finds secret sauce for cloud formation
Some organic compounds make a huge difference. Cosmic rays? Not so much.
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Researchers think they’ve spotted huge volcanic calderas on Mars
Massive, Yellowstone-style eruptions once graced the red planet's surface.
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Signs of oxygen in 3-billion-year-old soil
Which means photosynthesis is at least that old.
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IPCC climate change report is out: It’s warmer and we’re responsible
Recent slowdown due to La Niñas, volcanos, and a slight lull in solar radiation.
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Comparing models to Pliocene climate, when CO2 was last this high
Warming in Arctic may have been greater than our models are showing.
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East Coast mantle hotspot could explain massive Missouri quakes
If it exists, Hawaii-style hotspot would have passed under New England.
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Clean Air Act was boon to Appalachian forests
Sulfur pollution shown to have slowed tree growth.
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Latest XPRIZE competition takes on ocean acidification
$2 million awaits designers of pH sensors that can gather the data we need.
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Mars’ Olympus Mons may have company in biggest volcanoes club—on Earth
Geophysicists studied an underwater body called the Tamu Massif. And it's massive.
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Feature Story
Why trust climate models? It’s a matter of simple science
How climate scientists test, test again, and use their simulation tools.
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Sandy-like storms not projected to become more common
Models don’t show the conditions that created Sandy increase as climate warms.
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(Not) Blinded by the light
New Mexico park earns recognition for its dark skies
Lack of light pollution makes for fantastic stargazing.
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Ocean acidification could affect rising temperatures
New research shows the two aren’t entirely separate.
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Recent slowdown in atmospheric warming thanks to La Niña
Models match global temps by letting Pacific run the show.
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Massive Himalayan gorge partly carved by Lake Erie-sized floods
When glacial dams upriver from the gorge failed, massive floods tore through it.
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No Biggie
Latest test of SpaceX Grasshopper adds a twist
The prototype flies laterally before coming back down.