GENERAL KNOWLEDGE

Detailed explanation-1: -Hubble’s law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving away from Earth.

Detailed explanation-2: -The distant galaxies we see in all directions are moving away from the Earth, as evidenced by their red shifts. Hubble’s law describes this expansion.

Detailed explanation-3: -Galaxies moving toward earth shift toward the blue end of the spectrum; those moving away shift toward the red. By plotting the distance of eighteen galaxies against their red shifts, Hubble discovered a direct relationship: Galaxies were moving away from earth at a rate proportional to their distance from us.