What is the average temperature of the Milky Way galaxy?

Answer 1

That depends on what part of the Milky Way you mean. The interior of some stars gets up to a billion Kelvin or so; the interstellar gas is approximately at 3 Kelvin.

Not a valid question. There is no constant temperature, but it ranges from absolute zero (-273.15 °C/-459.67°F) in the dead of space to hundreds of billions of degrees in the cores of some larger suns while going through particularly violent cycles.

I suppose it would depend on how you are counting the average temperature.

If you look at the average temperature on objects with mass. Then the majority of the mass in the Milky Way is in the stars, and your calculation would be somewhere on the order of the temperature of the sun.

If, on the other hand, you are looking at the average temperature of every square meter, or whatever unit... then the majority of the space is very far from each star. And, your temperature would be very cold.

Let's take the Pluto as representative of this. Pluto's average temperature is: (-238°C to -228°C, or 35 K to 45 K).

That is probably a high estimate. The notes I'm seeing are showing around: 2.725 Kelvin. -270°C, or -455°F

Answer 2

The average temperature of the Milky Way galaxy is estimated to be around 10 million degrees Celsius. This temperature is due to the hot gases and stars present in the galaxy.