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Space

Can NASA, Air Force, and Private Industry Really Mitigate an Asteroid Threat? 151

coondoggie writes "There has been much chatter about the threat of an asteroid or significant meteor strike on Earth — mostly caused by the untracked meteor that blasted its way to international attention when it exploded in the sky above Russia injuring nearly 1,200 people in February. It was one of those amazing coincidences that on that same day an asteroid NASA had been tracking for months — asteroid 2012 DA14 — was to harmlessly cross Earth's path. Those events and the topic of mitigating asteroid and meteor or Near Earth Object threats to Earth prompted a couple congressional hearings by the Committee on Science, Space, and Technology, the latest of which was held this week. None of the NEOs found to date have more than a tiny chance of hitting Earth in the next century. Thus the near-term risk of an unwarned impact from large asteroids, and hence the majority of the risk from all NEOs, has been reduced by more than 90%. Assuming none are found to be an impact threat, discovering 90% of the 140 meter sized objects will further reduce the total risk to the 99% level. By finding these objects early enough and tracking their motions over the next 100 years, even those rare objects that might be found threatening could be deflected using existing technologies."
Earth

Will Renewable Energy Ever Meet All Our Energy Needs? 626

Lasrick writes "Dawn Stover has another great piece detailing why renewable energy will never provide us with all our energy needs. She deconstructs the unrealistic World Wildlife Fund report (co-written by several solar companies) that claims renewables will be able to provide 100% of the energy needs of several countries by 2050. From the article: 'When renewable energy experts get together, they tend to rhapsodize about the possibilities, believing that this will somehow inspire others to make their visions come true. But ambitious plans to power entire countries on solar energy (or wind or nuclear power, for that matter) don't have a snowball's chance in Australia. Such schemes are doomed to fail, and not because of the economic "reality" or the political "reality" -- however daunting those may be. They are doomed because of the physical reality: It's simply not physically possible for the world's human population to continue growing in numbers, affluence, and energy consumption without trashing the planet.'"

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Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (5) All right, who's the wiseguy who stuck this trigraph stuff in here?

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