So, what is the coldest planet in our Solar System now? It sounds like a simple question, but actually, there are two planets in the running for this title. It all depends on whether we are talking about the average temperature of the planet or the lowest temperature the planet reaches. Most would say the coldest planet in our solar system is the frosty Neptune. This is because it is the eighth planet in our solar system and therefore the furthest away from the Sun.
The Sun is our primary heat source so it would make sense that the planet with the greatest distance from it would be the coldest. Neptune is known as an Ice Giant and for a good reason. It has an average temperature of around degrees Celsius.
This makes finding a surface temperature difficult, but research conducted from Earth and fly by missions have managed to take this average temperature from the upper atmosphere. Curiously though, Neptune only holds the title for the coldest average temperature, and it is the seventh planet from the Sun, Uranus, that has the record for the lowest temperature.
This has been recorded at a very low degrees Celsius. This is unexpected as Uranus is more than a billion miles closer to the Sun than Neptune. So why would anyone want to go? Well before the run-away greenhouse effect started billions of years ago, Venus might have been quite similar to the Earth, maybe similar enough to have once supported life. View more questions. Meet our experts.
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