Given how many times intelligent civilizations could have appeared over the universe's history, it is most likely that if other civilizations exist, they will

A) be slightly less advanced than us
B) be much less advanced than us
C) have about the same level of technology as us
D) be much more advanced than us


D

Physics & Space Science

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A mirror has a focal length -20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?

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(a) How high does it go? (b) How long is it in the air?

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What will be an ideal response?

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