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Underground microbes may have swarmed ancient Mars

According to French scientists, ancient Mars may have had an environment capable of supporting an underground world teeming with microscopic organisms. The researchers concluded that if these simple life forms existed, they would have altered the atmosphere so profoundly that they would have triggered a...

Professors call for more research into climate-change-related threats to civilization

An opinion piece published today in the Proceedings of the National Academy of Sciences calls for more research into the specific pathways by which civilization may collapse as a result of climate change. "Scientists have warned that climate change threatens the habitability of large regions...

Scientists shine light on 66-million-year-old meteorite wildfire mystery

Scientists have discovered that the meteorite that wiped out Earth's dinosaurs instantly ignited forest wildfires thousands of kilometers away from its impact zone. At the end of the Cretaceous Period 66 million years ago, a six-mile-wide meteorite struck the Yucatan peninsula in what is now...

Scientists reveal magnetic reconnection details that trigger solar filament eruption

A solar filament eruption causes a coronal mass ejection, which is a major cause of space weather. Understanding how filaments erupt is thus critical for forecasting space weather. Both observations and simulations indicate that filament eruption is closely related to the emergence of magnetic fluxes....

Tropical wetlands emit more methane than previously thought

Since 2007, the world's atmospheric methane concentration has increased rapidly, but scientists aren't sure why. This is a problem because methane is an extremely powerful greenhouse gas. During its first 20 years in the atmosphere, it has more than 80 times the warming power...

Little Ice Age study reveals North Atlantic reached tipping point

Scientists used centuries-old clam shells to reconstruct how the North Atlantic climate system reached a "tipping point" prior to the Little Ice Age. The Little Ice Age was a period of regional cooling, particularly in the North Atlantic, that lasted several centuries and ended around...