lensing can show the presence of dark matter just as they can help detect black holes. 8) Do the scrambled science activity to explain why physicists think that 80% of the matter in our universe is dark matter – a new form of matter that has never been detected directly.9)Black holes are different from dark matter because black holes A) interact with light, have more total mass, are made from ordinary matter B) are denser, have more total mass, are made from ordinary matter C) are denser, interact with light, are made from ordinary matter D) are denser, interact with light, have more total mass, Black holes are concentrations of mass, whereas dark matter seems to be spread out. Black holes will interact with light; they just won’t emit the light once it has captured it. The dark matter may be diffuse but it is responsible for much more mass than all the black holes. It’s like a rock compared to the entire atmosphere. Black holes are formed from ordinary matter, though what it is like at the singularity is unknown. p. 279 #1 – 4, p. 284 #4-6, p. 309 #36, 46
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