As an expert in astronomy, I can tell you that the concept of the "coldest planet in the universe" is a bit misleading. The universe is vast and contains countless celestial bodies, many of which are not planets. However, when we talk about the coldest planet-like objects within our solar system, we often refer to those that are farthest from the Sun, as distance from a star typically correlates with lower temperatures.

The planets in our solar system are, in order of increasing distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Among these, Neptune is the farthest from the Sun and is considered the coldest, with an average temperature of about -214 degrees Celsius (-353.2 degrees Fahrenheit).

However, if we expand our scope to include objects beyond the planets, such as dwarf planets and moons, there are colder places. For example, Pluto, which is a dwarf planet, has an average temperature around -375 degrees Fahrenheit (-225 degrees Celsius), which is colder than Neptune.

Beyond our solar system, there are exoplanets (planets outside our solar system) with a wide range of temperatures, some of which are much colder than any planet in our solar system. The coldest known exoplanet, WASP-33b, has a day side temperature of about 2,600 degrees Fahrenheit (1,430 degrees Celsius), but its night side is extremely cold due to a phenomenon called temperature inversion.

In conclusion, the coldest planet in our solar system is likely Neptune, but when considering all celestial bodies, there are colder dwarf planets and exoplanets.

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As the planets in our Solar System get further away from the Sun, they generally get colder. So what is the coldest planet of our Solar System. That would be Neptune, the 8th and final planet in the Solar System. If Pluto was still a planet, it would be colder, but now it's Neptune.read more >>