News tagged with early earth
Early Earth may have been prone to deep freezes: study
Two University of Colorado Boulder researchers who have adapted a three-dimensional, general circulation model of Earth's climate to a time some 2.8 billion years ago when the sun was significantly fainter than present think ...
Space & Earth / Earth Sciences
Dec 05, 2011 |
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Rise of atmospheric oxygen more complicated than previously thought
The appearance of oxygen in the Earth's atmosphere probably did not occur as a single event, but as a long series of starts and stops, according to an international team of researchers who investigated rock ...
Space & Earth / Earth Sciences
Dec 01, 2011 |
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Setting the stage for life: Scientists make key discovery about the atmosphere of early Earth
Scientists in the New York Center for Astrobiology at Rensselaer Polytechnic Institute have used the oldest minerals on Earth to reconstruct the atmospheric conditions present on Earth very soon after its birth. The findings, ...
Space & Earth / Earth Sciences
Nov 30, 2011 |
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Large asteroid nears Earth for rare flyby
A big asteroid is set to make its closest flyby of Earth in 200 years on Tuesday, but there is no chance of a crash landing when it zips past our planet, NASA said.
Space & Earth / Space Exploration
Nov 08, 2011 |
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Rare near-Earth asteroid fly-by set for Tuesday
A massive asteroid will make a rare fly-by Tuesday, and although it poses no danger of crashing to Earth, US scientists said this week they are looking forward to getting a closer look.
Space & Earth / Space Exploration
Nov 03, 2011 |
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Rendezvous with a near Earth object
(PhysOrg.com) -- One of the most accessible goals for human spaceflight is a rendezvous with a Near Earth Object (NEO). NEOs are asteroids or comets whose orbits take them close to the earth's orbit. An NEO ...
Space & Earth / Space Exploration
Oct 25, 2011 |
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Poisonous oceans delayed animal evolution
Animals require oxygen, but oxygenated environments were rare on early Earth. New research from University of Southern Denmark shows that poisonous sulfide existed in the oceans 750 million years ago making ...
Space & Earth / Earth Sciences
Oct 24, 2011 |
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Fossil moths reveal their true colors
Moths dead for 47 million years are again showing their true colors. For the first time, scientists have reconstructed the colors of an ancient fossil moth. The findings detailed not just a few spots of color, ...
Other Sciences / Archaeology & Fossils
Oct 12, 2011 |
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First life may have arisen above serpentine rock, researchers say
(PhysOrg.com) -- About 3.8 billion years ago, Earth was teeming with unicellular life. A little more than 4.5 billion years ago, the Earth was a ball of vaporous rock. And somewhere in between, the first organisms ...
Space & Earth / Earth Sciences
Sep 23, 2011 |
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Evidence for a persistently iron-rich ocean changes views on Earth's early history
Over the last half a billion years, the ocean has mostly been full of oxygen and teeming with animal life. But earlier, before animals had evolved, oxygen was harder to come by. Now a new study led by researchers ...
Space & Earth / Earth Sciences
Sep 07, 2011 |
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Earth-bound asteroids come from stony asteroids, new studies confirm
Researchers got their first up-close look at dust from the surface of a small, stony asteroid after the Hayabusa spacecraft scooped some up and brought it back to Earth. Analysis of these dust particles, detailed ...
Space & Earth / Space Exploration
Aug 25, 2011 |
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Amino acid alphabet soup
All life on Earth relies on a standard set of 20 amino acids to build the proteins that carry out life's essential actions. But did it have to be this way?
Aug 19, 2011 |
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Physicists uncover new data on adenine, a crucial building block of life
Early Earth's atmosphere provided little shielding for ultraviolet light from space, so many prebiotic molecules, bombarded by it and light of other wavelengths, had a hard time surviving at all. But some molecules became ...
Aug 18, 2011 |
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Meteorites: Tool kits for creating life on Earth
Meteorites hold a record of the chemicals that existed in the early Solar System and that may have been a crucial source of the organic compounds that gave rise to life on Earth. Since the 1960s, scientists have been trying ...
Space & Earth / Space Exploration
Aug 08, 2011 |
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Penn State expert determined to find life on Earth-like planets
Thanks to popular Hollywood films like "E.T.," "Avatar" and "Super 8," life on other planets seems highly conceivable to people who have considered the idea that we are not alone in the universe. Jim Kasting, distinguished ...
Jun 17, 2011 |
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