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	Science News Headlines - Yahoo! News
	(Sponsor this newsletter) Spring Skywatching: Constellation Leo Comes in Like a Lion One of the surest signs of spring for stargazers is the constellation Leo high in the evening sky. One of the 12 traditional constellations of the zodiac, Leo is one of the best-known star patterns in the sky. Read More » Scientists create self-powering camera By Elly Park New York, NEW YORK - Scientists at Columbia University in New York have successfully built a camera that is capable of producing images using power harvested from the surrounding incident light.  The prototype self-powering camera takes an image each second, and in a well-lit scene it can operate indefinitely. The team is led by Shree Nayar, Professor of Computer Science at Columbia Engineering,  "What we have designed here is an image sensor with pixels, with this new design that can not only capture pictures but also generate power from the pixels, in order to capture the images themselves. In modern cameras photo diodes, tiny devices inside each pixels of the image sensor, measure the amount of light that falls onto it, and Nayar said he noticed that the process is similar to photo diodes used inside solar panels to harvest energy.   "It turns out exactly the photo diode is also used in solar cells which are used in solar panels to harvest energy from light, except that they are being used in a slightly different circuit. Read More » U.S. eyes new ways to prepare and win future war in space By Andrea Shalal COLORADO SPRINGS, Colo. (Reuters) - The United States needs disruptive new technologies, new ways of acquiring equipment and bandwidth, and closer ties with global allies to stay ahead of growing challenges in space from China, Russia and others, the head of U.S. Air Force Space Command told Reuters. General John Hyten said the United States had been bracing for threats to its satellite systems for years, but continued anti-satellite testing by potential foes had fueled a fresh sense of urgency in both industry and government about the need to prepare to win a possible war in space. Read More » 2015 Already Setting Heat Records The first three months of 2015 set new global heat records, government officials announced today (April 17). Read More » Scientists: 3 wolves remain at Isle Royale National Park TRAVERSE CITY, Mich. (AP) — The gray wolves of Isle Royale National Park, which scientists have studied closely for more than half a century along with the moose on which they feed, are on the verge of disappearing as the most recent census showed that only three remain, scientists said Friday. Read More » Evidence of Pre-Columbus Trade Found in Alaska House Bronze artifacts discovered in a 1,000-year-old house in Alaska suggest trade was occurring between East Asia and the New World centuries before the voyages of Columbus. Archaeologists found the artifacts at the "Rising Whale" site at Cape Espenberg. "When you're looking at the site from a little ways away, it looks like a bowhead [whale] coming to the surface," said Owen Mason, a research associate at the University of Colorado, who is part of a team excavating the site. The new discoveries, combined with other finds made over the past 100 years, suggest trade items and ideas were reaching Alaska from East Asian civilizations well before Christopher Columbus arrived in the Caribbean Sea in 1492 archaeologists said. Read More »
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