GENERAL KNOWLEDGE

Detailed explanation-1: -Astronomers have found that the further from us a star is, the more its light is red-shifted. This tells us that distant galaxies are moving away from us, and that the further away a galaxy is, the faster it’s moving away.

Detailed explanation-2: -The galaxies are moving away from Earth because the fabric of space itself is expanding. While galaxies themselves are on the move-the Andromeda Galaxy and the Milky Way, for example, are on a collision course (opens in new tab)-there is an overall phenomenon of redshift happening as the universe gets bigger.

Detailed explanation-3: -As objects move away from us, their light gets shifted into longer wavelengths or the red end of the spectrum-that’s redshift. Blueshift is the opposite, when light is shifted to shorter wavelengths on the blue side of the spectrum as an object comes towards us.

Detailed explanation-4: -The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.