[OFFICIAIL] AQA GCSE Physics unit 1 thread

what would you say for 'how does red-shift support the big bang theory'?

Since red is toward the longer wavelength side of the visible light spectrum, this allows us to combine our knowledge of redshift/doppler effect to support the big bang theory. This is because, as galaxies move away the em waves they emit (as light) are stretched out because of the movement. This stretching results in waves of a slightly greater wavelength, thus they are red. Because of this we can tell that they are moving away, not toward, as the light would be blue - this supports the big bang theory, as the big bang theory states that the universe expanded outward from a single point (singularity) and the movement of galaxies show that this expansion is still continuing today.