Here's why:
* Doppler Effect: Redshift is a consequence of the Doppler Effect, which applies to all waves, including light. The Doppler Effect describes how the frequency of a wave changes when the source of the wave is moving relative to the observer.
* Moving Away: When a light source moves away from us, the wavelengths of the emitted light are stretched, causing them to shift towards the red end of the electromagnetic spectrum.
* Increased Wavelength: Since the speed of light is constant, stretching the wavelengths means decreasing the frequency of the light. Lower frequency corresponds to redder light.
Key Points:
* Redshift is a measure of how fast an object is moving away from us.
* The greater the redshift, the faster the object is moving away.
* Redshift is an important tool in astronomy, allowing us to study the expansion of the universe and the motion of galaxies.
Let me know if you'd like more detail on any of these points!
