Debate over the origin of large-scale polygons (hundreds of meters to kilometers in diameter) on Mars remains active even after several decades of detailed observations. Similarity in geometric patterns on Mars and Earth ...
Space Exploration
Jul 27, 2012
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(PhysOrg.com) -- ESA's Mars Express has returned strong evidence for an ocean once covering part of Mars. Using radar, it has detected sediments reminiscent of an ocean floor within the boundaries of previously identified, ...
Space Exploration
Feb 7, 2012
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For some time, scientists have known that Mars was once a much warmer and wetter environment than it is today. However, between 4.2 and 3.7 billion years ago, its atmosphere was slowly stripped away, which turned the surface ...
Space Exploration
Sep 14, 2018
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41
Geologists have found the fossil of the earliest known animal predator. The 560-million-year-old specimen is the first of its kind, but it is related to the group that includes corals, jellyfish and anemones living on the ...
Plants & Animals
Jul 27, 2022
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884
If you could dive down to the ocean floor nearly 540 million years ago just past the point where waves begin to break, you would find an explosion of life—scores of worm-like animals and other sea creatures tunneling complex ...
Archaeology
Aug 14, 2020
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338
Scientists have created a more accurate history of how Earth's climate has varied over the last 1.5 million years, after developing a new method that lets them draw on natural temperature records that have never before been ...
Earth Sciences
Oct 11, 2012
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(PhysOrg.com) -- New evidence gleaned by analyzing calcium embedded in Chinese limestone suggests that volcanoes, which spewed massive amounts of carbon dioxide into the atmosphere for a million years, caused the biggest ...
Earth Sciences
Apr 27, 2010
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(PhysOrg.com) -- The scalding-hot sea that supposedly covered the early Earth may in fact never have existed, according to a new study by Stanford University researchers who analyzed isotope ratios in 3.4 billion-year-old ...
Earth Sciences
Nov 11, 2009
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The chemical composition of our oceans is not constant but has varied significantly over geological time. In a study published this week in Science, researchers describe a novel method for reconstructing past ocean chemistry ...
Earth Sciences
Feb 5, 2010
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(Phys.org)—Using a combination of traditional and innovative model-building techniques, scientists in the U.S. and a specialist in Denmark have created a lifelike reconstruction of an ancient mollusk, offering a vivid portrait ...
Archaeology
Sep 19, 2012
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