P3.3.2 Detecting Alien Life Flashcards

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1
Q

How can scientists estimate if there are Earth-like planets out there that can support life?

A

They use mathematical models.

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2
Q

Who created the Drake equation, which predicts how many planets are likely to have life on them?

A

Frank Drake

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3
Q

What does SETI stand for?

A

Search for Extra-Terrestrial Intelligence

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4
Q

How does SETI work?

A

Using radio telescopes which detect radio signals from space.

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5
Q

Which types of electromagnetic radiation can reach the Earth’s surface?

A

Most radio waves, visible light and some infrared and ultraviolet radiation.

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6
Q

What happens to the other types of electromagnetic radiation?

A

The rest are absorbed by the atmosphere.

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7
Q

What essential features do you need for Earth-like life?

A

Energy source, liquid water and oxygen

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8
Q

How can astronomers work out what stars are made of?

A

By looking at the light that they emit. They produce a line spectrum

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9
Q

What do the black lines on a line spectrum mean?

A

They show which elements are present in the gas the light has travelled through. We can compare this to gases we already know the spectra for.

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