The "Big Bang Theory" explains the origin of the universe from the earliest known period through its subsequent large scale evolution. The measurement of the expansion rate of the universe places this moment approximately 15 billion years ago, which is thus considered the age of the universe.

Subhramanyam Chandrashekhar was a great scientist and - Nobel Prize winner who first gave details on black hole theory. He is known for Chandrasekar limit which showed that there is a maximum mass which is supported against gravity by pressure made up of electrons and atomic nuclei (The value of this limit is about 1.44 times of solar Mass) which was derived by Chandrasekar in 1930. He was awarded Noble Prize jointly with W.A. Fowler in Physics in 1983.

According to the International Astronomical Union, there are 89 constellations in the sky. Most of these imaginary patterns can be seen from the southern hemisphere. It will take a full year to get a glimpse of all the constellations.

Brittle star is not an astronomical object. Brittle stars are echinoderms in the class ophiuroidea closely related to starfish. These are aquatic creatures and crawl on the sea surface, while Pulsar is celestial body emitting very regular pulses of radio waves. Quasar is an astronomical object of very high luminosity found in the centres of some galaxies at a distance of billions of light - years. A black hole is also a cosmic body of extremely intense gravity from which nothing (even light) can escape and by the death of a massive star.

The solar system was formed around 4.568 billion years ago. The solar system consists sun (star), cosmic dust or masses attached with each other by gravitational force, planets, dwarf Planets, natural planetoid, asteroids, comets, meteoroid and cosmic dust while Nebulae is not a part of Solar System.

The diamond-ring effect occurs at the beginning and end of totality during a total solar eclipse. As the last bits of sunlight pass through the valley on the moon's limb and the faint corona around the sun is just becoming visible, it looks like a ring with a glittering diamond on it. Notably, a total solar eclipse can not last for more than 8 minutes.

According to NASA, the size of the sun is 109.2 times the diameter of the earth. The diameter of the sun is 1,392,000 km while the equatorial diameter of the earth is 12,756 km.

Venus and Mercury are the only planets in the solar system which do not have any natural satellites or Moon, while Earth has 1 moon, Mars - 2 moons, Jupiter - 67 moons, , Uranus - 27 moons and Neptune has 14 moons.

Venus is known the Evening Star and also as the Morning Star while Mars is called the Red Planet, and Saturn is one which has rings known as Saturn's Rings.

Venus is called as 'Morning Star' and 'Evening Star' as it is the brightest planet of all. Venus is also called 'twin sister' of earth as venus and earth are almost the same size and same mass and have a very similar composition.