The question should be the other way around, "Why is the planet cooler than when it was younger?".
The answer is it started out molten, and has been gradually cooling down since then.
In our solar system, the hottest planet is Venus. Even though the planet is second-closest to the sun, Venus' atmosphere holds in a lot of the heat, making it hotter than Mercury.
venus
Of the known planets that scientists have discovered, no, there is not a planet that is hotter than the sun.
Mercury's surface gets hotter than any other planet because it is closest to the sun.
Yes, a lot hotter.
a lot hotter
The further away a planet is from the sun the colder it is, the closer a planet is the hotter the planet is.
mercury because it is closest to the sun
It would be Mercury.
It's a lot hotter
Florida is a lot hotter because it is closer to the equator.
NO it is not there is hotter stars.