How can the temperature of all planets be determined?

This graphic shows the average temperatures of various destinations in our solar system. (Planets not to scale) read more

So, to determine the temperature, all one needs to do is measure the energy over the waveband of interest, and one can get the temperature. In the case of Pluto, an easier method can be done. We know the total amount of energy going toward Pluto, based off of its distance from the Sun. read more

All the planets besides Earth lack a breathable atmosphere for terrestrial beings, but also, many of them are too hot or too cold to sustain life. A “habitable zone” which exists within every system of planets orbiting a star. read more