Articles with the keyword: 
Did lack of comet impacts help life evolve?
sea-maid submitted, created time 2 days 2 hours (www.newscientist.com)
IT SEEMS we got off lightly in the cosmic lottery. Deadly comet impacts may be much rarer in our solar system than in others nearby. 
First detection of carbon dioxide in an exoplanet
sea-maid submitted, created time 1 week 2 days (www.sciencenews.org)
Moving one step closer to finding the fingerprints of life in a habitable planet beyond the solar system, astronomers have for the first time detected carbon dioxide in the atmosphere of a planet that orbits a star other than the sun.
The extrasolar planet and its star lie about sixty-three light-years from Earth. A gaseous body slightly bigger than Jupiter, the orb circles its parent star at a proximity that renders it far too hot to support life
Microbes drove Earth's mineral evolution
sea-maid submitted, created time 2 weeks 2 days (www.nature.com)
A comprehensive history of Earth's mineral wealth concludes that without life, many raw materials wouldn't exist. In the early interstellar medium, scientists say, there were about twelve minerals. The planetary formation process upped this to around sixty. The addition of water (itself a mineral) allows for more different kinds of reactions and the mineral count jumps into the hundreds
Darkfrog submitted, created time 1 month 1 week (www.nature.com)
About 2.4 billion years ago, Earth's oxygen levels rose sharply, in what has turned out to be a prerequisite for almost every form of life (I am assuming that aquatic oxygen levels rose as well). This is one of the reasons why scientists studying early life and the origins of life have always considered the 2.4 billion mark to coincide with the emergence of photosynthetic organisms.
However, geologists in Australia have unearthed some shale that shows markings from hydrocarbons that "could only have been put there by photosynthetic organisms." Their date stamp? 2.7 billion years. ..
Scientists develop new method to investigate origin of life
sea-maid submitted, created time 2 months 4 weeks (esciencenews.com)
Scientists at Penn State have developed a new computational method that they say will help them to understand how life began on Earth. The team's method has the potential to trace the evolutionary histories of proteins all the way back to either cells or viruses, thus settling the debate once and for all over which of these life forms came first. "We have just begun to tap the potential power of this method," said Randen Patterson, a Penn State assistant professor of biology and one of the project's leaders
Take a Deep Breath--and Thank Mount Everest
sea-maid submitted, created time 3 months 3 weeks (sciencenow.sciencemag.org)
Next time you pause to view a scenic mountain vista, consider that the oxygen your lungs are taking in resulted from the same process that raised those peaks. Researchers have connected the periodic formation of supercontinents in Earth's geological past to the nourishment of tiny, oxygen-producing sea creatures, and the process continues to this day.....
Did newborn Earth harbor life?
sea-maid submitted, created time 4 months 4 weeks (space.newscientist.com)
Life on Earth might have emerged about 750 million years earlier than previously thought, new research suggests.
Extreme Life in the Martian Arctic?
sea-maid submitted, created time 5 months 1 week (www.time.com)
Bizarre microbes flourish in the most punishing environments on Earth from the bone-dry Atacama Desert in Chile to the boiling hot springs of Yellowstone National Park to the sunless sea bottom vents in the Pacific. Could such exotic life emerge in the frigid arctic plains of Mars?
jerry submitted, created time 5 months 1 week (sciencenow.sciencemag.org)
NASA's "follow the water" approach to finding life--or evidence of past life--on Mars has finally hit pay dirt. Three weeks into its 90-day mission, the Phoenix lander has scraped a few centimeters down to an irrefutable layer of water ice in the martian arctic. The first robotic contact with water on Mars promises a score of chemical analyses in the next few months that could reveal whether this ice ever melted to liquid water that could have supported living organisms. And the discovery has already revealed some new mysteries beyond the question of life.
Life Cooked Up in Outer Space?
jerry submitted, created time 5 months 1 week (sciencenow.sciencemag.org)
The odds are improving that life exists beyond Earth. A European-U.S. team reports that a meteorite that formed billions of years ago and eventually crashed on our planet harbors two important components of RNA and DNA, the fundamental molecules of life. The findings could help explain how life got started on Earth, and they suggest that the ingredients for life have been liberally sprinkled throughout the solar system, if not the galaxy.
Organic materials discovered in outer space
Eric wu submitted, created time 8 months 3 days (sciencenow.sciencemag.org)
Radio astronomers have found the first evidence of an amino acid-like molecule in outer space, floating in a dust cloud 25,000 light-years away. Although the discovery doesn't prove that complex organic structures originated in space, it does present strong evidence that the basic ingredients for living organisms exist elsewhere in the galaxy--and that they could be seeding many young planets with life's building blocks.
Sue Wu submitted, created time 9 months 4 weeks (discovermagazine.com)
If life on Earth arose from ice, then our chances of finding life elsewhere in the solar system—not to mention elsewhere in the galaxy—may be better than we ever imagined.
Should Fertilized Eggs Have Rights?
Eric wu submitted, created time 1 year 1 week (www.time.com)
If Colorado for Equal Rights for Human Life and other anti-abortion groups can wrangle 76,000 signatures in the next six months, theirs could be the first state in the nation to vote on whether a fertilized egg should legally be considered a person. Despite resistance from abortion-rights groups, the Colorado Supreme Court on November 13 approved the ballot measure — 40 years after Colorado became the first state to relax abortion laws — giving a boost to a conservative political movement that has worked doggedly for decades to overturn Roe v. Wade
How were DNA and protein molecules formed during the process of the origin of life?
pang xiaofeng submitted, created time 1 year 3 weeks (www.discover8.com)
We propose a new mechanism for the formation of DNA and protein molecules in the process of the origin of life based on the discovery of clustered chain structures of water molecules of size 2-70nm which exist in addition to the free molecules present in water. We suggest that not only was water a suitable environment for the appearance of DNA and protein molecules in primordial times but also that water molecules, with their clustered chain structures, were the templates for the formation of DNA and protein molecules
How did chemical constituents essential to life arise on primitive Earth?
carly submitted, created time 1 year 1 month (www.eurekalert.org)
Chemists at the University of Georgia have now proposed the first detailed, feasible mechanism to explain how adenine, one of the four building blocks of DNA, might be built up from the combination of five cyanide molecules. The investigation is based on extensive quantum chemical computations over several years.
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