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Closer Look Questions
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Extraterrestrials



1

What is an extraterrestrial?
2

Why do people believe that extraterrestrials might exist?
3

Discuss some of the problems involved in the use of radio telescopes in the search for extraterrestrials.

Dark Energy



4

What is dark energy?
5

How is our understanding of "dark energy" increasing?

Dark Matter



6

Discuss why knowing the density of the universe is important to astronomers.
7

What is dark matter?
8

What are the two schools of thought about the nature of dark matter?





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