For the first time in history, man has a detailed accounting of what makes up the universe. Yet, 95 percent of the universe defies detection. Lawrence Livermore National Lab scientist Steve Asztalos explains how scientists have come to this understanding of the universe and what they think makes up about 25 percent of its mass. (#15211)
K-12 Educational Standards
Standards for Grade(s): 9-12
Earths Place in the Universe
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