Habitable zone

Definition

The habitable zone is the region around a star where conditions might be right for liquid water to exist on a planet's surface. This zone is crucial for the potential for life as we know it.

5 Must Know Facts For Your Next Test

1. The habitable zone is also known as the 'Goldilocks Zone' because conditions are 'just right' for life.
2. The boundaries of the habitable zone depend on the star's luminosity and temperature.
3. A planet within this zone must have the right atmospheric conditions to support liquid water.
4. Earth is located within the Sun's habitable zone, which allows it to sustain life.
5. The concept of a habitable zone helps astronomers narrow down their search for extraterrestrial life.

Review Questions

• Why is the habitable zone important in the search for extraterrestrial life?
• How do a star’s luminosity and temperature affect its habitable zone?
• What factors other than being in the habitable zone determine if a planet can support life?

Related terms

Exoplanet: A planet that orbits a star outside our solar system

Luminosity: The intrinsic brightness of a celestial object, such as a star

Astrobiology: The study of life in the universe, including life's origins and distribution