Venus is the hottest planet in the solar system.
Mercury is not the coldest planet because it has more solar radiation than all of the other planets. This is because it is closer to the Sun. However, Mercury is not the hottest planet in the Solar System. See related question.
VenusMercuryEarthMarsJupiter
Neptune and Uranus
It is the coldest planet. If you include the Dwarf Planet Pluto, then Pluto is colder.
It isn't. In fact, it is the hottest planet in our solar system.
Neptune has an average temperature of -200C, making it the coldest planet in the solar system (at least now that Pluto has been demoted from planetary status).
Mercury -during the day it is very hot -at night it is very cold because of its slow rotation
Actually Venus is the hottest planet in the solar system because of it's thick atmosphere that taps the heat below the atmosphere. Pluto is the coldest planet because it is the farthest away from the sun.
That's rather a difficult question. Since we have explored so few planets, we have no way of making a totally accurate statement. It is presumable that the further away from the sun a planet is, the colder. By this logic, it can be said that Sedna is the coldest body in the solar system. However, since we have not explored the Oort Cloud, we cannot make a more informed estimation or measurement.
its the last of the eight planets. and the farthest with the coldest moon in the solar system
The two coldest planets are also the two that are furthest from the sun. These are Uranus and Neptune.