Some of the most dramatic climatic events in our planet鈥檚 history are 鈥淪nowball Earth鈥� events that happened hundreds of millions of years ago, when almost the entire planet was encased in ice up to 0.6 miles thick. New research from the 蘑菇视频 provides a more complete picture for how the last Snowball Earth event ended, and suggests why it preceded a dramatic expansion of life on Earth, including the emergence of the first animals.
Field observations from an unusual lake show that in environments known as 鈥渟oda lakes鈥� phosphate can concentrate at the very high levels needed for the basic molecules of life to emerge. A shallow, salty lake in western Canada gives new support to Charles Darwin鈥檚 idea that life could have emerged in a 鈥渨arm little pond.鈥�
The American Geophysical Union announced Sept. 13 that five 蘑菇视频 faculty members have been elected as new fellows, representing the departments of astronomy, Earth and space sciences, oceanography, global health, and environmental and occupational health sciences.
Evidence from rocks billions of years old suggest that volcanoes played a key role in the rise of oxygen in the atmosphere of the early Earth.
Tiny meteorites that fell to Earth 2.7 billion years ago suggest that the atmosphere at that time was high in carbon dioxide, which agrees with current understanding of how our planet’s atmospheric gases changed over time.
Life as we know it requires phosphorus, which is scarce. So, how did a lifeless environment on the early Earth supply this key ingredient? A new 蘑菇视频 study, published Dec. 30 in the Proceedings of the National Academy of Sciences, finds an answer to this problem in certain types of carbonate-rich lakes.
A roundup of 蘑菇视频 talents and presentations in AbSciCon2019, the national conference on astrobiology — the search for life in the universe — to be held in Bellevue, June 24-28.
The subsurface ocean of Saturn’s moon Enceladus probably has higher than previously known concentrations of carbon dioxide and hydrogen and a more Earthlike pH level, possibly providing conditions favorable to life, according to new research from planetary scientists at the 蘑菇视频.
Researchers with the 蘑菇视频-led Virtual Planetary Laboratory are central to a group of papers published by NASA researchers today in the journal Astrobiology outlining the history 鈥� and suggesting the future 鈥� of the search for life on exoplanets, or those orbiting stars other than the sun.
Earth has had moderate temperatures throughout its early history, and neutral seawater acidity. This means other rocky planets could likely also maintain this equilibrium and allow life to evolve.
A 蘑菇视频 study has found a simple approach to look for life that might be more promising than just looking for oxygen.
Evidence from the age of the dinosaurs to today shows that chemical weathering of rocks is less sensitive to global temperature, and may depend on the steepness of the surface. The results call into question the role of rocks in setting our planet’s temperature over millions of years.
The idea that the young Earth had a thicker atmosphere turns out to be wrong. New research from the 蘑菇视频 uses bubbles trapped in 2.7 billion-year-old rocks to show that air at that time exerted at most half the pressure of today’s atmosphere. The results, published online May 9 in Nature Geoscience, reverse the commonly accepted idea that the early Earth had a thicker atmosphere to compensate for weaker sunlight. The finding also has implications for which gases…
It took 100 million years for oxygen levels in the oceans and atmosphere to increase to the level that allowed the explosion of animal life on Earth about 600 million years ago, according to a study co-authored by two 蘑菇视频 scientists and led by the University College London.
An atmospheric peculiarity the Earth shares with Jupiter, Saturn, Uranus and Neptune is likely common to billions of planets, 蘑菇视频 astronomers have found, and knowing that may help in the search for potentially habitable worlds.