The Big Bang Theory and Red-Shift _ GCSE Physics

The video explains the Big Bang theory, describing how the universe began from a tiny point and continues to expand. It introduces the Doppler effect, using sound examples like a passing siren to explain frequency changes. This concept is applied to light, explaining how distant stars exhibit redshift, indicating they are moving away. The video discusses spectral lines as evidence of redshift and clarifies that redshift doesn't mean objects appear red, but rather have longer wavelengths.

What new insight or understanding did you gain from this video?