NASA
Answer questions like ...
- Earth is smack in the middle of the "habitable zone" around the sun, where temperatures are right for liquid water to exist.
- Earth's magnetic field shields us from solar wind and helps hold onto the atmosphere and water. To what do we owe this invisible protector?
- Exoplanets that have a lot of volcanic activity and exist in systems with many asteroids are bad prospects for looking for extraterrestrial life.
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