Chapter 11: Introduction to Section 3 Flashcards

1
Q

A collision of a large celestial object—comets, asteroids, and so on—with the Earth is called an ______ ______.

A

impact event

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2
Q

A layer of sediment with high amounts of _________ spread across the planet, is known as the _________ – _________boundary .

A

iridium, Cretaceous–Paleogene

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3
Q

Paleontologists had known for decades that _________ dinosaur fossils are found only below the K–Pg boundary but did not know why until about forty years ago

A

nonflying

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4
Q

The is ________ ________is based upon a thought experiment on the overwhelming mathematical probabilities that there is life elsewhere in our galaxy, not to mention the universe

A

Fermi Paradox

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5
Q

A highly intelligent, technologically advanced civilization may develop self-replicating machines that might colonize other planets, and through logarithmic growth, the galaxy and the universe. These are called: _____ _____ _____.

A

Von Neumann Probes

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6
Q

The _________ _________argues that the galaxy is indeed filled with intelligent, technologically advanced extraterrestrials that observe us at a distance

A

Zoo Hypothesis

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7
Q

According to Rafalovich in the introduction to Section 3, having a keen ______ may work against species longevity.

A

intelligence

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