2014年11月19日
Philae has gone into standby because of low power
Carbon-containing "organics" are the basis of life on Earth and may give clues to chemical ingredients delivered to our planet early in its history.
The compounds were picked up by a German-built instrument designed to "sniff" the comet's thin atmosphere.
Other analyses suggest the comet's surface is largely water-ice covered with a thin dust layer.
The European Space Agency (Esa) craft touched down on the Comet 67P on 12 November after a 10-year journey.拉菲紅酒
Dr Fred Goessmann, principal investigator on the Cosac instrument, which made the organics detection, confirmed the find to BBC News. But he added that the team was still trying to interpret the results.
It has not been disclosed which molecules have been found, or how complex they are.
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There's a trade off - once it gets too hot, Philae will die as well. There is a sweet spot”
Prof Mark McCaughrean Senior science adviser, Esa
But the results are likely to provide insights into the possible role of comets in contributing some of the chemical building blocks to the primordial mix from which life evolved on the early Earth.
Preliminary results from the Mupus instrument, which deployed a hammer to the comet after Philae's landing, suggest there is a layer of dust 10-20cm thick on the surface with very hard water-ice underneath.
The ice would be frozen solid at temperatures encountered in the outer Solar System - Mupus data suggest this layer has a tensile strength similar to sandstone.门禁系统公司
"It's within a very broad spectrum of ice models. It was harder than expected at that location, but it's still within bounds," said Prof Mark McCaughrean, senior science adviser to Esa, told BBC News.
"People will be playing with [mathematical] models of pure water-ice mixed with certain amount of dust."
Philae has gone into standby because of low power
He explained: "You can't rule out rock, but if you look at the global story, we know the overall density of the comet is 0.4g/cubic cm. There's no way the thing's made of rock.
"It's more likely there's sintered ice at the surface with more porous material lower down that hasn't been exposed to the Sun in the same way."
After bouncing off the surface at least twice, Philae came to a stop in some sort of high-walled trap.
"The fact that we landed up against something may actu
葡萄酒
The compounds were picked up by a German-built instrument designed to "sniff" the comet's thin atmosphere.
Other analyses suggest the comet's surface is largely water-ice covered with a thin dust layer.
The European Space Agency (Esa) craft touched down on the Comet 67P on 12 November after a 10-year journey.拉菲紅酒
Dr Fred Goessmann, principal investigator on the Cosac instrument, which made the organics detection, confirmed the find to BBC News. But he added that the team was still trying to interpret the results.
It has not been disclosed which molecules have been found, or how complex they are.
Continue reading the main story
“Start Quote
There's a trade off - once it gets too hot, Philae will die as well. There is a sweet spot”
Prof Mark McCaughrean Senior science adviser, Esa
But the results are likely to provide insights into the possible role of comets in contributing some of the chemical building blocks to the primordial mix from which life evolved on the early Earth.
Preliminary results from the Mupus instrument, which deployed a hammer to the comet after Philae's landing, suggest there is a layer of dust 10-20cm thick on the surface with very hard water-ice underneath.
The ice would be frozen solid at temperatures encountered in the outer Solar System - Mupus data suggest this layer has a tensile strength similar to sandstone.门禁系统公司
"It's within a very broad spectrum of ice models. It was harder than expected at that location, but it's still within bounds," said Prof Mark McCaughrean, senior science adviser to Esa, told BBC News.
"People will be playing with [mathematical] models of pure water-ice mixed with certain amount of dust."
Philae has gone into standby because of low power
He explained: "You can't rule out rock, but if you look at the global story, we know the overall density of the comet is 0.4g/cubic cm. There's no way the thing's made of rock.
"It's more likely there's sintered ice at the surface with more porous material lower down that hasn't been exposed to the Sun in the same way."
After bouncing off the surface at least twice, Philae came to a stop in some sort of high-walled trap.
"The fact that we landed up against something may actu
葡萄酒
Who is Alan Curtis?
tbsp finely sliced spring onions
Franceschi aren't worrying any more.
you are a sweet-smelling diamon
Jawbone is seeking compensation
planting heroin in her luggage.
tbsp finely sliced spring onions
Franceschi aren't worrying any more.
you are a sweet-smelling diamon
Jawbone is seeking compensation
planting heroin in her luggage.
Posted by wuyulin at 11:52│Comments(0)
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