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Space observatories are among some of the most magnificent buildings devoted entirely to science — because their windows look out on the universe. …University of Michigan
RECYCLING ROCKS<br>A sampling of posters from the hundreds online<p>Rocks are classified into three main groups, according to how they are formed: (1) igneous rocks, (2) sedimentary rocks and (3) metamorphic rocks.<p>Rocks are never actually destroyed; they are broken down and recycled in the rock cycle.
STELLAR EVOLUTION<br>Protostars of differing mass develop differently<p><i>Click on image for larger version.<br>More images of stellar evolution …</i>
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