Question

How do we know the universe is expanding using redshift?

Answer 1

Hint: So, if a star is moving towards Earth, it seems to produce light that is much more limited in frequency contrasted with a wellspring of light that isn't moving. Conversely, the light from a star moving endlessly from us appears to move towards longer frequencies. As this is towards the red finish of the range, cosmologists call it redshift.

Complete answer:
The redshift is a final consequence of the doppler influence. Articles which are moving endlessly finally move to the red. At the point when Hubble found the red move known to man, it made a seismic move on the planet's perspective on the universe. The very concept of redshift is an aftereffect of light waves being spread out as the waves move away from the spectator. The spreading out of the waves expands the frequency noticed. Red is the longest frequency in the noticeable range. Along these lines, the redshift showed that the universe is moving ceaselessly from the spectators on the earth.
The end from Hubble's perceptions of the redshift is that the universe is extended outward from some starting point as expected. This end is steady with the perceptions of the redshift through the universe, and the material science of the doppler impact.

Note:Before the Hubble researchers accepted that the current universe was an everlasting existing in a consistent state. These Hubble's perceptions annihilated this world view completely. The end is that the current universe has a start and matter, and energy is not unceasing.