Astronomy a beginners guide to the universe 8th CHaisson mcmillan chapter 18 clicker questions

The Drake equation attempts to define the number of© 2017 Pearson Education, Inc... The Drake equation attempts to define the number ofGalaxy... In the Drake equation, a technical civili

TO THE UNIVERSE

EIGHTH EDITION

CHAPTER 18 Life in the Universe

Clickers

The Drake equation attempts to define the number of

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The Drake equation attempts to define the number of

Galaxy.

water

In the Drake equation, a technical civilization is defined as one that is able to

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In the Drake equation, a technical civilization is defined as one that is able to

The possibility of life once existing on Mars was supported by the discovery of

the past

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The possibility of life once existing on Mars was supported by the discovery of

the past

Explanation: The exploration of the

Mars rovers Spirit and Opportunity,

as well as the Global Surveyor

mission, have provided evidence that

water did exist on Mars in the past

The habitable zone is the area where

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The habitable zone is the area where

the atmosphere

Way Galaxy

Explanation: Habitable zones have the right

temperature for life—neither too hot nor too cold

Habitable zones must be smaller and closer to a

cool star like the Sun because such a star emits

Which star is the best candidate for seeking extraterrestrial life?

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Which star is the best candidate for seeking

extraterrestrial life?

Explanation: In the OBAFGKM spectral ranking scale, K-type main-sequence stars are cooler than the Sun, but will shine long enough with nonlethal radiation to allow life to form and evolve

The “water hole” is a region

ice in a deep crater

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The “water hole” is a region

ice in a deep crater

rich in water are formed

Explanation: The “water hole” may be

the best part of the electromagnetic

spectrum for intelligent civilizations to

communicate across the vast reaches

of space.

An extremophile is

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An extremophile is

Pluto in the most distant regions

of our solar system

extreme environments.