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IB Biology HL A1.1.8 Goldilocks Zone and Life Question Bank

Practise IB Biology HL A1.1.8 by identifying the Goldilocks zone as the orbital region where conditions may support extraterrestrial life.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Use tabulated planetary data to identify a candidate in the Goldilocks zone.

A1.1.8 (HL)—Search for extraterrestrial life and water question 1

[Maximum number: 1]

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

Planet

Temperature /∘C/{ }^{\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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