Have you ever wondered why space with an infinite number of stars and other luminous celestial bodies is so dark?
The answer to this seemingly easy question pondered the minds of astronomers of the 15 -17th century such as Kepler, Edmond Halley and William Olbers.
William Heinrich Olbers ,A german astronomer of the 17th Century Proposed the ***Dark Night Sky Paradox*** which was later renamed to **Olbers’ Paradox**.
#### The Olbers’ Paradox
<blockquote>The Paradox is that a static, infinitely old universe with an infinite number of stars distributed in an infinitely large space would be luminously brighter than dark</blockquote>

#### Lord Kelvin Gave A more satisfactory resolution to the Olbers’ Paradox in 1901.
<blockquote>Were the Succession of stars endless then the background of the night sky would present us with a uniform luminosity like that displayed by the galaxy.
Since there could be absolutely no point,in all that background,at which would not exist a star/
The Only mode, therefore, in which under such a state of affairs, we could comprehend the voids which our telescopes find in innumerable directions, would be by supposing the distance of the invisible background so immense that no ray from it has yet been able to reach us at all</blockquote>

This paradox proposed an illuminated night sky if the universe was static but the universe is increasingly expanding at an accelerated rate. The darkness of space supports the big bang theory; the expansion of the universe from a singularity at high density and temperature before cooling to allow formation of subatomic particles, stars and galaxies and has been expanding progressively since.

Galaxies are constantly racing away from each other and the light emitted by the stars which illuminates the night sky experience redshift due to the expansion. Redshift is the increase in wavelength of the electromagnetic radiation such as light, it is the Doppler effect of light, and the intensity of the light emitted by the stars reduces in wavelength before reaching our point of view.

The Night Sky is dark because the radiation from the stars have been red-shifted due to the universe constant expansion and the large distance of the stars.

![planet_space_shadow_stars_68889_4000x2480.jpg](https://steemitimages.com/DQmTghWFCEWDsVpME96XmuYykHdLPDXgFUVZZzv6ZLoSCAx/planet_space_shadow_stars_68889_4000x2480.jpg)

[Source](https://wallpaperscraft.com/image/planet_space_shadow_stars_68889_4000x2480.jpg)