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Life in the Cosmos > SETI > Flashcards

SETI Flashcards

1
Q

Who carried out the first SETI observations?

A

Frank Drake in 1960 and 1961

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2
Q

What was Project Ozma?

A

SETI experiments in 1960

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3
Q

What was the aim of Project Ozma?

A

Search for signs of life through interstellar radio waves

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4
Q

What radio telescope did they use for Project Ozma?

A

43m radio telescope in Green Bank

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5
Q

What did they do to search for Project Ozma?

A

Search for any regular patterns that would not occur naturally

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6
Q

Who dominated SETi in 1960s-1970s?

A

Soviet Union
US

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7
Q

What happened to the SETI program in the US in the 1980s?

A

1981 - funding removed from NASAs budget
1984 - All NASA funding observations gone

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8
Q

Who established the SETI institute?

A

Carl Sagan

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9
Q

What year was the SETI institute established?

A

1984

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10
Q

What happened in 1994 to SETI insitute?

A

US gov cancelled all NASA funding fully so SETI became privately funded

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11
Q

What was Project Phoenix?

A

Study of 800 sun-like stars within 200 lyr.
Using rented telescopes from 1995-2004

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12
Q

What was the conclusion of Project Phoenix?

A

We live in a quiet neighbourhood

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13
Q

Who donated to SETI in 2000?

A

Paul Allen to build huge array for SETI

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14
Q

What is the Allen Telescope array made up of?

A

350x 6.1 m dishes

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15
Q

What is the Drake Equation?

A

Estimate number of civilisations in the Milky way today able to communicate with us

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16
Q

What are the two types of extraterrestrial signals?

A

Passive signals
Active signals

17
Q

What is Ns in the Drake Equation?

A

Number of relevant stars in the milky way.
Roughly 100 billion

18
Q

What is fs in the drake equation?

A

Fraction of solar-type stars
Roughly 1/200

19
Q

What is Np in the drake equation?

A

Number of planets per solar-type star
Estimated 0.1

20
Q

What is fe in the drake equation?

A

Fraction of planets that are Earth-like
Estimated 0.1

21
Q

What is fi in drake equation?

A

Fraction of Earth-like planets on which life develops
Estimated 0.2

22
Q

What is fc in the drake equation?

A

Fraction of planets with life that develop civilisation
Estimated 0.5

23
Q

What is L in the drake equation?

A

lifetime of civilisation as a fraction of the lifetime of the Milky Way
Estimated X/10 power of 10

24
Q

What is the overall value calculated from the drake equation?

A

X/20000

25
Q

If civilisations last for one million years what is estimation for number of civilisations in the galaxy?

A

50

26
Q

What would be the average seperation in the galaxy?

A

5500 ly

27
Q

What is the quietest part of the EM-spectrum?

A

3cm < x < 30cm

28
Q

Why is the wavelengths 18-21cm especially quiet?

A

It is the water hole
Strongest hydroxyl radical OH radiates at 18cm and Hydrogen at 21cm

29
Q

What is Pioneer 10?

A

Active SETI
Carry plaque in case its found by intelligent life-forms
12 billion km away

30
Q

How have humans been unintentionally sending out transmittions into space?

A

Radio, TV, radar

31
Q

How far away can we be detected?

A

4000 ly
900 million stars at this distance

32
Q

What message was sent out in 1974?

A

Sent by Arecibo to globular cluster M13
23 rows by 74 columns

33
Q

What messages have been recieved?

A

Wow signal 1977
Ohio State Uni radio observatory
30x above background noise

34
Q

What is a low frequency array?

A

Radio telescope working at lowest frequency accessible from earth.
Combine receives with computing

35
Q

LOFAR in the UK?

A

Near Winchester opened in 2010

36
Q

Where was green bank telescope tuned to?

A

21cm emission come from interstellar hydrogen

37
Q

What are the 4 things on Pioneer plaque?

A

Outline of humans
Position of sun relative to 14 pulsars
Map of our SS
Transition in neutral hydrogen

Life in the Cosmos (18 decks)

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