SE1 unit4A

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Se: unit 4a P.44-447

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Galaxy stars astronomer telescope Solar system planets

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One reason is the amount of time since the universe started. The other main reason is the huge number of galaxies and stars.

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Two astronomers explain why they believe intelligent life exists somewhere in the universe and we may soon contact with these beings.

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3-6 8-12 20-23 22-24

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12 billion huge galaxies smaller radio signals

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powerful messages searching for identify tools

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