Evidences in Support of Big Bang Theory
Evidence | Interpretation |
The light from other galaxies is red-shifted. | The other galaxies are moving away from us. |
The further away the galaxy, the more its light is red-shifted. | The most likely explanation is that the whole universe is expanding. This supports the theory that the start of the universe could have been from a single explosion. |
Cosmic Microwave Background | The relatively uniform background radiation is the remains of energy created just after the Big Bang. |
According to Nebular Hypothesis the planets were formed out of a cloud of material associated with a youthful sun, which was slowly rotating. The theory was give by German Philosopher Immanuel Kant (Though he did not use word Nebular) and later revised by Mathematician Laplace in 1796. You will learn about Kant in Moral Thinkers (GS Paper IV).
2.1. The Units of Measuring Distances in the Universe
♤ The extremely vast distances between the various heavenly bodies like the stars and planets can be well expressed in terms Astronomical Unit (A.U), Light year, and Parsec.
♤ Astronomical unit is defined as the mean distance from the earth to the sun. One AU is equal to 1.5×108kilometres.
♤ Light year is the distance travelled by light in one year. It is equal to 9.46×10¹² kilometres.
♤ Parsec: It represents the distance at which the radius of Earth’s orbit subtends an angle of
one second of arc. One parsec equals about 3.26 light-years or 30.9 trillion kilometres.
