Because they are the farthest from the sun.
It is the coldest planet. If you include the Dwarf Planet Pluto, then Pluto is colder.
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).
Uranus and Neptune are the coldest planets in our solar system due to their distance from the Sun and their composition. Uranus has the coldest temperature recorded in our solar system, dropping to -224 degrees Celsius.
Neptune and Pluto are the two coldest planets!
probably pluto the dwarf planet or if pluto is not a planet for you then it's neptune
The smallest and coldest planet in our solar system is Pluto. It is a dwarf planet located on the outer edges of our solar system, and its surface temperatures can drop as low as -375 degrees Fahrenheit (-225 degrees Celsius).
Pluto
The second coldest planet in our solar system is Uranus, with temperatures reaching as low as -224 degrees Celsius. However, Neptune is slightly colder with temperatures dropping to around -218 degrees Celsius.
The coldest planet is Neptune.
Now that Pluto is not considered a planet,Neptune is the coldest followed by uranus. But many scientist believe Uranus is colder than neptune because the coldest temprature recorded in uranus is colder than neptune's
pluto.
well technically its not a planet no more but Pluto