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Fresh evidence has been revealed to support the theory that life on Earth began in space. NASA's Stardust probe, a specially-designed-comet ‘chaser’, successfully collected particles shed from Comet Wild 2 back in 2004, and NASA scientists have since confirmed for the first time that amino acids can indeed be found on these extraterrestrial bodies.
Amino acids, the building blocks of life, form the basis of proteins and are created when carbon compounds and water are energized by particles such as protons. Samples of Glycine were confirmed by NASA labs after extensive testing. Dr Jamie Elsila, lead author of a paper on the research, said: “Glycine is an amino acid used by living organisms to make proteins, and this is the first time an amino acid has been found in a comet. Our discovery supports the theory that some of life's ingredients formed in space and were delivered to Earth long ago by meteorite and comet impacts."
Stardust gathered samples from the comet’s trail by passing through gas and dust and using a special grid filled with aerogel to collect the debris. This was parachuted back to Earth in January 2006 and scientists have been analyzing it since. "We actually analyzed aluminum foil from the sides of tiny chambers that hold the aerogel in the collection grid," said Elsila. "As gas molecules passed through the aerogel, some stuck to the foil. We spent two years testing and developing our equipment to make it accurate and sensitive enough to analyze such incredibly tiny samples."
Before this announcement could be made, extensive testing took place to confirm that the Glycine did in fact originate in space and to rule out possible contamination from sources on our planet. This research used isotopic analysis of the foil and successfully confirmed that the comet-based Glycine contained more of the heavier Carbon 13 atoms than Glycine from Earth, which led Elsila to announce: “We discovered that the Stardust-returned Glycine has an extraterrestrial carbon isotope signature, indicating that it originated on the comet".
The next stage would be to gather more information from the main nucleus of a comet, which is likely to contain more complex mixtures of amino acids at higher levels. This is predictably quite tricky to do, though NASA is optimistic that Europe’s Rosetta spacecraft, the first designed to orbit and land on a comet, will successfully achieve its goal when it reaches Comet 67P in 2014, after a ten-year journey.

- Policy Recommendations
- Calculate a biofuel's ecological footprint
- Promote only biofuels that can be produced sustainably
- Select highly efficient species for biofuels
- Work to minimize land needed for biofuels
- Encourage reclamation of degraded areas
- Prohibit clearing areas for more cultivation
- Promote use of energy crops that require less fertilizer, pesticide and energy
- Promote native and perennial species
- Prohibit use of invasive species
- Promote crop rotation on cultivated lands
- Encourage soil conservation
- Promote only biofuels that are at least net carbon neutral
The Hamiltonian Path Problem is to start at node 1, end at node 5,and visit each node exactly once. (For those without a bacterial computer the answer is 1→4→7→2→3→6→5).
The prospects of a Future Inevitable Internet Collapse™ has some of our readers seriously freaked out. You know the type -- they live in places like Idaho and Montana, in fortified mountaintop retreats, where they hoard digital media like it was canned food in December 1999. And concerns over bandwidth aren't limited to a lunatic fringe -- no less august a publication than IEEE Spectrum has recently posted an article by Lawrence G. Roberts (who pretty much helped invent the modern router) in which he discusses the state of the Internet. According to Roberts, our current routers are still designed to handle much smaller amounts of data than they are currently pushing. Streaming data only works at all, he says, due to extreme over-provisioning -- "Network operators," he says, are throwing "bandwidth at a problem that really requires a computing solution."Read Article
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