How do astronomers tell whether an exoplanet could have liquid water?
Quick Answer
They estimate the planet’s temperature based on its star and orbit, then compare it to the habitable zone. They also look for atmosphere clues that could raise or lower surface temperatures.
The Full Story
A planet is considered potentially capable of liquid water if it receives the right amount of energy from its star. Astronomers calculate this using the star’s brightness and the planet’s distance, then refine the estimate with atmospheric data when available. A planet in the habitable zone is not guaranteed to have water, but it is a starting point. Many factors, including greenhouse gases and cloud cover, can make a big difference.
Key Facts
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