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NASA may have unknowingly found and killed alien life on Mars 50 years ago, scientist claimsOne researcher hypothesizes that experiments carried out by NASA's Viking landers in 1976 could have inadvertently killed microbes living in Martian rocks. Other experts are skeptical.
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Bizarre polygons on Mars' surface hint that alien life on Red Planet was possibleA patchwork of polygon-shaped cracks in ancient Martian mud are evidence of past wet-dry cycles, which could have helped extraterrestrial life emerge on the Red Planet.
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Volcanoes like Kīlauea and Mauna Loa don't erupt like we thought they did, scientists discoverThe magma that erupts from basaltic volcanoes in the middle of tectonic plates originates from within Earth's mantle — rather than from the outer crust — and is propelled upward by CO2, not water.
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How does water put out fire?Water extinguishes fire, but it doesn't act on the flames themselves.
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Human impact on Earth's tilt leaves researchers 'surprised and concerned'Groundwater extracted for irrigation and other human activities displaced 2,150 gigatons of water between 1993 and 2010.
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Do fish get thirsty?How much water a fish drinks depends on the saltiness of its surroundings.
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New mud-slinging thermal feature at Yellowstone is spewing scalding hot muckThe unrest may be due to slight changes in pressure or in the amount of water seeping into the underground reservoir system.
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How many oceans are there?One, four or five? Not all experts agree on the number of oceans on our planet.
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Crocodiles and gharials are getting bizarre orange 'tans' in Nepal. Here's why.Researchers think it could be down to where these crocs are hanging out.
