Chapter 11: Introduction to Section 3 Flashcards
A collision of a large celestial object—comets, asteroids, and so on—with the Earth is called an ______ ______.
impact event
A layer of sediment with high amounts of _________ spread across the planet, is known as the _________ – _________boundary .
iridium, Cretaceous–Paleogene
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
nonflying
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
Fermi Paradox
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: _____ _____ _____.
Von Neumann Probes
The _________ _________argues that the galaxy is indeed filled with intelligent, technologically advanced extraterrestrials that observe us at a distance
Zoo Hypothesis
According to Rafalovich in the introduction to Section 3, having a keen ______ may work against species longevity.
intelligence