Question

As we know temperature is the average K.E of molecules then how we can measure the temperature of space where molecule is not present?​

Answer 1

Explanation:

We can calculate the temperature of the space by measuring the wavelengths of the cosmic microwave background radiation.

Answer 2

Explanation:

There are several answers to this question

1. We can land probes on various object, such as asteroid,comets and airless moons and measure the surface temperature in sunlight and in shade
2. We can take the spectrum of atom and dust particles and small bits of rock nad derive temperature from that
3. We can measure the blackbody temperature of the cosmic microwave background radiation(CMBR)
4. We can in principle measure the temperature of the cosmic Neutrino Background radiation, if current experiment work out
5. We can calculate but not measure the blackbody temperature of Hawking radiation from black hole of various sizes