IB Biology HL A1.1.8 Hl Search for Extraterrestrial Life and Water Questions

Learn why liquid water guides the search for extraterrestrial life, how Goldilocks zones indicate where surface liquid water could exist, and how transit spectroscopy detects water signatures in exoplanet atmospheres.

Exam points

Explain why liquid water guides searches for extraterrestrial life and how a Goldilocks zone identifies orbital conditions where surface liquid water could exist.
Describe how transit spectroscopy can detect water signatures in exoplanet atmospheres.

[Maximum number: 1]

Which planet in the table falls within the "Goldilocks zone" and may be capable of sustaining extraterrestrial life?

Planet

Temperature $/{ }^{\circ} \mathrm{C}$

Atmosphere

Gravity / g

Kepler-22b

-11 to 16

unknown

2.4

WASP-39b

750

hydrogen, helium and other elements

25.0

Gliese 876d

50 to 80

high levels of toxic gases

20.0

Kepler-16b

-100

unknown

0.9

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IB Biology HL A1.1.8 Hl Search for Extraterrestrial Life and Water Questions question 1