How is it we humans can find the tempurature of other planets?

Question

How is it we humans can find the tempurature of other planets?

Answer 1

they just guesstimate,like this: xyxy star has the temperature around 300 to 400 C,so they don't know exactly!

Answer 2

Tiga sta has answered the question most effectively

Answer 3

All objects emit light.  The Sun emits white light because it's really quite hot.  And "white" means that the peak intensity of the light's frequency is in the middle of our visible band that we see.  This isn't a coincidence, we evolved here, and our eyes make use of the peak intensity.

Planets emit heat, but since they are so much cooler, the frequency is in the infrared.  By taking an infrared spectrum, you can find out where the peak intensity is, and that gives you the temperature.

If the peak is in the xray part of the spectrum, it means that the object is millions of degrees.  Violent explosions, like supernovae produce this kind of temperature.

Answer 4

There are all kinds of ways. We've sent probes to all of the planets with temperature measuring devices, also known as thermometers.

Lex R, please refrain from answering questions on subjects where you clearly have no knowledge.  

Answer 5

By examining the radiation they emit in the infra-red spectrum. Everything emits infra-red proportional to its temperature - that's how thermal imaging cameras work. In the case of many of the planets in our solar system, we have sent probes to take direct readings as well.