What are the evidences of expanding universe?
1 Answer
Red shift repulsion of galaxies are considered as evidences of expanding universe.
Hubble demonstrated that all galaxies and distant astronomical objects were moving away from us, as predicted by a universal expansion. Using the Redshift of their electromagnetic spectra to determine the distance and speed of remote objects in space, he showed that all objects are moving away from us, and that their speed is proportional to their distance, a feature of metric expansion.
Things to remember from Universe and unit of distance
- The vast surrounding that contains everything that exists is called universe. It includes the sun, the planets, constellation, comets, stars, etc.
- The distance traveled by light in one year is called one light year.
- The nearest star from our solar system is Alpha Centaury which is about 4.3 light years far. It means light takes 4.3 years to reach from this star to our solar system.
- The nearest galaxy from our solar system is Andromeda which is about 2×106m light years away.
- The stars are heavenly bodies of glowing gases and are extremely hot.
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