February 28, 2014
Mohenjo
Science
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NASA has set up a “rapid response system” to pick the best candidates for its ambitious asteroid-capture mission.
The space agency aims to use a robotic spacecraft to haul a near-Earth asteroid into a stable lunar orbit, where astronauts would visit it in the future. It’s not as easy as just picking a space rock and going, however. Many asteroids are too big to be moved easily or are in unstable orbits. Others are too distant for telescopes to figure out what they’re made of, which could make them unsuitable candidates.
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August 28, 2013
Mohenjo
Science
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Researchers have reconstructed the structure of 4-billion-year-old proteins.
The primeval proteins, described today (Aug. 8) in the journal Structure, could reveal new insights about the origin of life, said study co-author José Manuel Sanchez Ruíz, a physical chemist at the University of Granada in Spain.
Exactly how life emerged on Earth more than 3 billion years ago is a mystery. Some scientists believe that lightning struck the primordial soup in ammonia-rich oceans, producing the complex molecules that formed the precursors to life. Others believe that chemical reactions at deep-sea hydrothermal vents gave rise to cell membranes and simple cellular pumps. And still others believe that space rocks brought the raw ingredients for life — or perhaps even life itself — to Earth.
But it’s difficult to recreate events that happened so far in the distant past.
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The individual molecules within early Earth’s primordial soup that form the basis of life likely developed in response to natural selection.
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August 22, 2013
Mohenjo
Science
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Ancient Egyptian beads found in a 5,000-year-old tomb were made from iron meteorites that fell to Earth from space, according to a new study. The beads, which are the oldest known iron artifacts in the world, were crafted roughly 2,000 years before Egypt’s Iron Age.
In 1911, nine tube-shaped beads were excavated from an ancient cemetery near the village of el-Gerzeh, which is located south of Cairo, said study lead author Thilo Rehren, a professor at UCL Qatar, a Western Asian outpost of the University College London’s Institute of Archaeology. The tomb dates back to approximately 3200 B.C., the researchers said.
Inside the tomb, which belonged to a teenage boy, the iron beads were strung together into a necklace alongside other exotic materials, including gold and gemstones. Early tests of the beads’ composition revealed curiously high concentrations of nickel, a telltale signature of iron meteorites.
“Even 100 years ago, [the beads] attracted attention as being something strange,” Rehren told LiveScience.
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June 30, 2013
Mohenjo
Science
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Farmers expect to reap what they sow. So it was quite a surprise when Bruce Lilienthal found a meteorite half-buried in a field on his farm in Minnesota’s Sibley County, the Minneapolis Star Tribune reported.
“We didn’t know what it was at first,” Lilienthal said of the flat, oddly heavy rock in an interview with KEYC-TV.
“We’ve done enough tests to be sure it’s a meteorite,” Dr. Calvin Alexander, a meteorite expert and professor of earth sciences at the University of Minnesota, told the Star Tribune. “It is not part of the Earth. It fell out of the sky.”
Dr. Alexander told The Huffington Post in an email that he examined the 33-pound rock at his office in Minneapolis on May 30, after Lilienthal and his wife brought it in. A variety of tests — including chemical analysis and electron microscopy — convinced him that what he calls the “Lilienthal object” is an iron meteorite.
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May 21, 2013
Mohenjo
Science
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The moon has a new hole on its surface thanks to a boulder that slammed into it in March, creating the biggest explosion scientists have seen on the moon since they started monitoring it.
The meteorite crashed on March 17, slamming into the lunar surface at a mind-boggling 56,000 mph (90,000 kph) and creating a new crater 65 feet wide (20 meters). The crash sparked a bright flash of light that would have been visible to anyone looking at the moon at the time with the naked eye, NASA scientists say.
“On March 17, 2013, an object about the size of a small boulder hit the lunar surface in Mare Imbrium,” Bill Cooke of NASA’s Meteoroid Environment Office said in a statement. “It exploded in a flash nearly 10 times as bright as anything we’ve ever seen before.” [The Greatest Lunar Crashes Ever]
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This artist’s illustration shows a meteor crashing into the surface of the moon. Scientists say hundreds of space rocks impact the lunar surface every year.
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May 21, 2013
Mohenjo
Science
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A gigantic asteroid will fly by our planet at the end of this month, making its closest approach for at least the next two centuries on May 31. But, don’t worry, it won’t get closer than about 3.6 million miles, which is around 15 times the distance between Earth and the moon.
Astronomers plan to use radar telescopes to get a good look at the space rock, named Asteroid 1998 QE2, between May 30 and June 9.
“Asteroid 1998 QE2 will be an outstanding radar imaging target at Goldstone and Arecibo [observatories] and we expect to obtain a series of high-resolution images that could reveal a wealth of surface features,” radar astronomer Lance Benner, the principal investigator for the Goldstone radar observations from NASA’s Jet Propulsion Laboratory, said in a written statement.
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April 10, 2013
Mohenjo
Science
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Scientists may have discovered the first meteorite from Mercury.
The green rock found in Morocco last year may be the first known visitor from the solar system’s innermost planet, according to meteorite scientist Anthony Irving, who unveiled the new findings this month at the 44th annual Lunar and Planetary Science Conference in The Woodlands, Texas. The study suggests that a space rock called NWA 7325 came from Mercury, and not an asteroid or Mars.
NWA 7325 is actually a group of 35 meteorite samples discovered in 2012 in Morocco. They are ancient, with Irving and his team dating the rocks to an age of about 4.56 billion years.
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