SPACE PHOTOS THIS WEEK: Mount Wilson Fire, Nebula, More

 SPACE PHOTOS THIS WEEK: Mount Wilson Fire, Nebula, More
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August 27, 2009--By measuring minute changes in Earth's gravitational field, NASA's twin Grace (Gravity Recovery and Climate Experiment) satellites, launched in 2002, are helping researchers gauge pressure on the seafloor on a global level. In this map, red represents regions where ocean pressure changed most; blue shows where it changed least.

Derived from lunar experiments that revealed that areas of great mass exert great gravitational pull, the new technique may help experts predict ocean-current and circulation changes in much the same way meteorologists use atmospheric pressure to forecast the weather.
—Image courtesy NASA
 
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