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A veritable flotilla of probes--some now in space, others soon to launch--are extending our understanding of the cosmos.
The Air Force expects to deploy its $3.5 billion system by 2017, and in the process improve its space debris tracking ten-fold. If it works, as many as 200,000 pieces of junk can be tracked.
The Sulzberger Ice Shelf calved icebergs the size of Manhattan after it was hit by the March 11 tsunami that devastated Japan, 8,000 miles away.