Sentences with phrase «photons at different wavelengths»

Not exact matches

Thus, measuring how much gamma rays of different energies are attenuated or weakened from blazars at different distances from Earth indirectly gives a measurement of how many EBL photons of different wavelengths exist along the line of sight from blazar to Earth over those different distances.

If we could carefully measure the number and energy (wavelength) of all those photons — not only at the present time, but also back in time — we might learn important secrets about the nature and evolution of the Universe, including how similar or different ancient galaxies were compared to the galaxies we see today.

Re 1 Timothy — the idea of an effecive emitting altitude is a useful though rough approximation — the photons leaving for space originate over a range of altitudes at any given frequency (wavelength), and that range shifts over different wavelengths.