GED Science TestEarth and Space ScienceMedium
A space probe detects an exoplanet orbiting its star within the 'habitable zone.' Which characteristic is primarily indicated by a planet being within its star's habitable zone?
- AThe planet has a strong magnetic field.
- BThe planet can potentially support liquid water on its surface.
- CThe planet has a dense, protective atmosphere.
- DThe planet has active volcanic activity.
Show answer & explanationAnswer & explanation
Correct answer: B. The planet can potentially support liquid water on its surface.
The habitable zone, also known as the Goldilocks zone, refers to the region around a star where conditions are just right for liquid water to exist on a planet's surface. Liquid water is considered essential for life as we know it.
Why the other options are wrong
- A. A strong magnetic field is important for life but not directly defined by the habitable zone.
- C. A dense atmosphere is beneficial but not the primary characteristic of being in the habitable zone.
- D. Volcanic activity is a geological process, not directly indicated by the habitable zone.
Habitable Zone
The region around a star where the temperature is neither too hot nor too cold, allowing for the potential existence of liquid water on a planet's surface.
- Often called the 'Goldilocks zone' because conditions are 'just right'.
- The size and location of the habitable zone depend on the star's luminosity.
- Liquid water is considered a key ingredient for life as we know it.
Memory trick: Goldilocks Zone: Just Right for Water's Home.