NASA identifies Venus as the hottest planet
NASA
NASA explicitly states that Mercury is not the hottest planet despite being nearest the Sun; Venus holds that distinction because of its dense atmosphere.
Based on: NASA
Verdict
False
Verification confidenceHigh
Explanation
No. Venus, not Mercury, is the hottest planet in our solar system. Being closest to the Sun does not automatically give a planet the highest surface temperature.
NASA reports that Mercury's daytime surface temperatures can reach about 430°C, while its nights can fall to about -180°C. ESA describes Venus's surface temperature as approximately 465°C, sustained by its dense atmosphere and powerful greenhouse effect.
The distinction is heat retention. Mercury has only a thin exosphere rather than a substantial atmosphere, while Venus's atmosphere traps heat. These figures describe surface conditions, not temperatures deep inside planets.
Key takeaway
Distance from the Sun is only part of the explanation. Venus's atmosphere makes its surface hotter than Mercury's.
Evidence
Contradicts the claim
ESA confirms Venus's exceptionally hot surface
European Space Agency
ESA describes Venus's surface as approximately 465°C and explains that atmospheric heat trapping produces its exceptionally high temperature.
Based on: European Space Agency
Mercury has extreme daytime and nighttime temperatures
NASA
Mercury's surface can reach about 430°C during the day and fall to about -180°C at night. Its thin exosphere does not retain heat like a substantial atmosphere.
Based on: NASA
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