Seawater holds clues to asteroid impacts: related news

Seawater holds clues to asteroid impacts

Asteroids that strike Earth have cosmic origins, but clues to the size of ancient impactors now have come from a decidedly Earth-bound source: the chemistry of ancient seawater.

Seawater holds clues to ancient asteroid impacts

Asteroids that strike Earth have cosmic origins, but clues to the size of ancient impactors now have come from a decidedly Earth-bound source: the chemistry of ancient seawater.

Seawater Holds Clues to Asteroid ImpactsMars Moon Seen Up CloseNew Super-Earth is Smallest YetScientists: Three Black Holes Can MergeSolar Wind Source FoundMassive Star Mystery: Do They Explode?Star Theory Gets New SpinMoon Seen as Laboratory for Lif

Asteroids that strike Earth have cosmic origins, but clues to the size of ancient impactors now have come from a decidedly Earth-bound source: the chemistry of ancient seawater.

Seawater Holds Clues to Asteroid Impacts

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Asteroid BB Gun

Meteors, Comets and Asteroids Summary (May 10, 2008): Researchers confirm that asteroid impacts can strike with enough force to liquefy carbon deep in the Earth's crust and eject it skyward to form beads that then blanket the planet. The finding is helping scientists interpret how past impacts effected life on Earth.

Missing Link Between Planets and Stars FoundSeawater Holds Clues to Asteroid ImpactsMars Moon Seen Up CloseNew Super-Earth is Smallest YetScientists: Three Black Holes Can MergeSolar Wind Source FoundMassive Star Mystery: Do They Explode?Star Theory

The difference between brown dwarfs and planets, based on conventional theory. Credit: Robert Roy Britt, SPACE.com.

Intelligence: A Rare Cosmic CommodityMissing Link Between Planets and Stars FoundSeawater Holds Clues to Asteroid ImpactsMars Moon Seen Up CloseNew Super-Earth is Smallest YetScientists: Three Black Holes Can MergeSolar Wind Source Found

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Intelligence: A Rare Cosmic CommodityMissing Link Between Planets and Stars FoundSeawater Holds Clues to Asteroid ImpactsMars Moon Seen Up CloseNew Super-Earth is Smallest YetScientists: Three Black Holes Can MergeSolar Wind Source FoundMassive Star

University of East Anglia Professor Andrew Watson developed a mathematical model showing that intelligent life is probably rare in the universe. Credit: Andrew Watson

Lunar Science Community Needs Rebuilding, Researchers SayIntelligence: A Rare Cosmic CommodityMissing Link Between Planets and Stars FoundSeawater Holds Clues to Asteroid ImpactsMars Moon Seen Up CloseNew Super-Earth is Smallest YetScientists: Three

This still image was cut out from a moving image taken by the HDTV onboard the KAGUYA then sent to the JAXA Usuda Deep Space Center. The Moon's surface is near the South Pole, and you can Australia (center left) and Asia (lower right) on the Earth. (In this image, the upper side of the Earth is the Southern Hemisphere, thus the Australian Continent looks upside-down.) Credit: JAXA/NHK.

Clay Tablet Holds Clue to Asteroid Mystery

British scientists have deciphered a mysterious ancient clay tablet and believe they have solved a riddle over a giant asteroid impact more than 5,000 years ago.

Clay tablet holds clue to asteroid mystery

British scientists have deciphered a mysterious ancient clay tablet and believe they have solved a riddle over a giant asteroid impact more than 5,000 years ago.

NASA Statement on Student Asteroid Calculations Regarding Asteroid Apophis Collision

April 16, 2008 -- WASHINGTON -- The Near-Earth Object Program Office at NASA's Jet Propulsion Laboratory in Pasadena, Calif., has not changed its current estimates for the very low probability (1 in 45,000) of an Earth impact by the asteroid Apophis in 2036.

Asteroid that killed dinosaurs downsized

The asteroid that wiped out the dinosaurs may not have been the whopper scientists thought. An analysis of the chemical remains of the asteroid that can be found in sediment under the sea today shows the rock was about 2 1/2 miles wide, according to Francois Paquay, a geology graduate student at the University of Hawaii at Manoa. That's significantly smaller than the estimates of up to 12 miles wide that past researchers had suggested was the size of the dinosaur-killer, according to the research published Friday in the journal Science.

Asteroid destroyed Sodom: Researchers

A clay tablet that puzzled scientists for 150 years was identified as an account of an asteroid suspected of destroying Sodom and Gomorrah. Researchers believe the cuneiform symbols on the Planisphere tablet record an asteroid thought to have been more than half a mile across.

Killer asteroid not as huge as believed?

An analysis of the chemical remains of the asteroid that can still be found in sediments under the sea today shows the rock was about four kilometres wide, according to Francois Paquay, a geology professor at the University of Hawaii. That's less than half the 9.6-kilometre-wide space boulder that past researchers have suggested was the dinosaur-killer, according to the research published Friday in the journal Science. The dinosaurs, which ruled Earth for 160 million years, went extinct at the end of the Cretaceous period about 65 million years ago. The killer asteroid theory was bolstered two decades ago, when scientists found in rocks dating from the Cretaceous period a band of iridium, a metal rare on Earth but common in meteorites. The later discovery of the 177-kilometre-wide Chicxulub crater off Mexico's Yucatan peninsula seemingly

65-million-year-old asteroid impact triggered a global hail of carbon beads

Carbon cenospheres are tiny, carbon-rich particles that form when coal and heavy fuel are heated intensely. Scientists have now learned that cenospheres can form in the wake of asteroid impacts, too. Photo by: Mark Harvey

65-million-year-old asteroid impact triggered a global hail of carbon beads

Carbon cenospheres are tiny, carbon-rich particles that form when coal and heavy fuel are heated intensely. Scientists have now learned that cenospheres can form in the wake of asteroid impacts,...

Schoolboy Corrects NASA's Math On Killer Asteroid

spiracle writes "A German schoolboy, Nico Marquardt, has revised NASA's figures for the chances that the Apophis asteroid will hit earth. Apparently if the asteroid hits a satellite in 2029, its path could be diverted enough to cause it to collide with Earth on the next orbit, in 2036. NASA had calculated the chances as 1 in 45,000 but the 13-year-old, in his science project, made it 1 in 450. NASA agreed."

NASA Planning Mission To 40-Meter-Wide Asteroid

FudRucker points out a story from The Guardian about NASA's plans to visit 2000SG344, an asteroid 40 meters wide and weighing roughly 71 million kilograms. The manned mission would take three to six months, and it would make use of the Orion spacecraft, which will be replacing to retiring space shuttle fleet. "A report seen by the Guardian notes that by sending astronauts on a three-month journey to the hurtling asteroid, scientists believe they would learn more about the psychological effects of long-term missions and the risks of working in deep space, and it would allow astronauts to test kits to convert subsurface ice into drinking water, breathable oxygen and even hydrogen to top up rocket fuel. All of which would be invaluable before embarking on a two-year expedition to Mars.

German Boy Corrects NASA's Asteroid Doom Odds

Over the years, NASA has made an incalculable number of advances in space technology and research, and those contributions have sometimes made life better for the world - but it appears that NASA might want to consider outsourcing its advanced doom calculations. A 13 year old German kid corrected an erroneous calculation made by NASA that was to determine the likelihood of a killer asteroid impacting the Earth. Apophis, the asteroid of death, is scheduled in April 2029 to orbit our planet in such a fashion that it might impact one of the 40,000 satellites currently hanging around up in space - and if Apophis does strike one of those satellites, Germany's little doom prophet calculated that it has a 1 in 450 chance of colliding with our planet on its next orbit in 2036.

Platypus genome explains animal's peculiar features; holds clues to evolution of mammals

The platypus, classified as a mammal because it produces milk and is covered in a coat of fur, also possesses features of reptiles, birds and their common ancestors, along with some curious attributes of its own.

Platypus Genome Explains Animal's Peculiar Features; Holds Clues To Evolution Of Mammals

An international consortium of scientists, led by Washington University School of Medicine in St. Louis, has decoded the genome of the platypus, showing that the animal's peculiar mix of features is reflected in its DNA. An analysis of the genome, published today in the journal Nature, can help scientists piece together a more complete picture of the evolution of all mammals, including humans.

Platypus genome explains animal's peculiar features; holds clues to evolution of mammals

An international consortium of scientists, led by Washington University School of Medicine in St. Louis, has decoded the genome of the platypus, showing that the animal's peculiar mix of features is reflected in its DNA. An analysis of the genome, published today in the journal Nature, can help scientists piece together a more complete picture of the evolution of all mammals, including humans.

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When a meteorite struck Earth before humans were around to watch, did it still make a "splat?" Although it's too late to witness the many pummelings our planet has already seen, scientists are still finding the humongous holes left here by long ago impacting space rocks.

Asteroid Impact 65 Million Years Ago Triggered A Global Hail Of Carbon Beads

The asteroid presumed to have wiped out the dinosaurs struck the Earth with such force that carbon deep in the Earth's crust liquefied, rocketed skyward, and formed tiny airborne beads that blanketed the planet, say scientists from the U.S., U.K., Italy, and New Zealand in this month's Geology.

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