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CAPE CANAVERAL, Fla. – Visibility of the United Launch Alliance Atlas V rocket carrying NASA's Solar Dynamics Observatory is good through the thin upper-level clouds through which it must travel to reach orbit. Liftoff from Launch Complex 41 on Cape Canaveral Air Force Station was at 10:23 a.m. EST Feb. 11. This is the 100th launch of a commercial Atlas_Centaur rocket. The observatory, known as SDO, is the first mission in NASA's Living With a Star Program and is designed to study the causes of solar variability and its impacts on Earth. The spacecraft's long-term measurements will give sol…
