3 ms·
depends on the observation. Anything in our galaxy or nearby galaxies is actual infra-red light at the source.
by adgjlsfhk1 4y ago
depends on the observation. Anything in our galaxy or nearby galaxies is actual infra-red light at the source.
- giantrobot 4y agoThat is not true. The light reaching us from most objects in our and nearby galaxies is pretty close to the original wavelength emitted. It takes extremely relative velocity to red shift for visible wavelengths to shift to infrared. Most stellar objects emit a whole bunch of wavelengths of light, some emit more IR than visible. Interstellar dust doesn't red shift light due to velocity but because the molecules absorb higher energy photons and re-emit lower energy photons.