P3.3.2 Detecting Alien Life Flashcards Preview

SHHS - Science - P3.3 Detection - Year 9 > P3.3.2 Detecting Alien Life > Flashcards

Flashcards in P3.3.2 Detecting Alien Life Deck (9)
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1

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

They use mathematical models.

2

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

Frank Drake

3

What does SETI stand for?

Search for Extra-Terrestrial Intelligence

4

How does SETI work?

Using radio telescopes which detect radio signals from space.

5

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

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

6

What happens to the other types of electromagnetic radiation?

The rest are absorbed by the atmosphere.

7

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

Energy source, liquid water and oxygen

8

How can astronomers work out what stars are made of?

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

9

What do the black lines on a line spectrum mean?

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.