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PCS 182 > Ch. 12 > Flashcards

Ch. 12 Flashcards

1
Q

SETI

A

Search for extraterrestrial intelligence

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2
Q

Drake equation is used for what

A

To estimate the number of intelligent civilizations in our galaxy

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3
Q

The number of habitable worlds in the galaxy is the product of

A

The fraction habitable planets, the fraction of worlds with life, the fraction of worlds with intelligent life, the fraction of time any civilization lives

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4
Q

How many stars fall in the galactic habitable zone

A

10%

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5
Q

Percent of stars with planets

A

70%

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6
Q

Ratio of life bearing worlds

A

1 in 5

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7
Q

Life on Earth seemed to be

A

inevitable and robust

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8
Q

Convergent evolution

A

argues for widespread intelligence examples are eyesight

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9
Q

Encephalization qutients

A

The ratio of brain to body mass

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10
Q

Human EQ

A

7

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11
Q

Radio

A

allows communication between worlds

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12
Q

Challenges of radio

A

You need to know which station to tune to (band) and know the right bandwidth

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13
Q

Three signal categories of SETI

A

Local communications, interplanetary or interstellar signals, signal beacons

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14
Q

Local communications of SETI include

A

Earth-based TV and radio signals

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15
Q

Radio was used by SETI because

A

cheap, easy and simple to discover

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16
Q

Kardashev Scale

A

Attempts to classify different rankings of civilizations based upon technological capacity to harness and utilize energy sources

17
Q

Types on Kardashev scale

A

Planetary (1), Stellar (2), Galactic (3)

18
Q

Planetary scale

A

civilizations are capable of using the resources of their home world

19
Q

Stellar scale

A

civilizations are capable of using the resources of their home star

20
Q

Galactic scale

A

civilizations are capable of using the resources of their home galaxy

21
Q

Humans are where on the Kardashev scale

A

0.72

PCS 182 (6 decks)

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