The Universe comprises of everything that exists from the galactic super clusters to the tinest sub-atomic particles and has a radius of about 46 billion light years with age about 13 to 15 billion years. The technique used for measuring the universe's cosmic microwaves background radiations and radio-active dating.
Top 10 of the nearest Star System
According to the Astronomy, there are 52 stellar systems beyond our own Solar system that currently lies within 16.3 light-years (5.0 parsecs / parallax-second) of the Sun. These systems contain a total of 63 stars, of which 50 are red dwarfs, by far the most common type of star in the Milky Way. The list of the Top 10 of the list is given below:
10. 61 Cygis
It is a binary star system (star system consisting of two stars orbiting around their common barycenter) in the constellation Cygnus, consisting of a pair of K-type dwarf stars.
9. Gx2 GQ Andromedae
It is also known as Groombridge 34 and is a binary star system (star system consisting of two stars orbiting around their common barycentre) in the north constellation of Andromeda.
8. Ross 248 (Andromedae)
It is also called HH Andromedae or Gliese 905 and, is a small star located in the north constellation of Andromeda. It was first cataloged by Frank Elmore Ross in 1926.
7. Sirius A & B
It is a star system and the brightest star in the Earth's night sky. It is also known Alpha Canis Majoris or the Dog Star.
6. UV Ceti A & B
It is also known as Luten 726-9 or Gliese 65. It is a binary star system (star system consisting of two stars orbiting around their common barycentre) which was discovered in 1948 by Willem Jacob Luyten.
5. Lalande 21185
It is a star in the Ursa Major.
4. Wolf 359 (CN Leows)
It is a red dwarf star located in the constellation Leo, near the ecliptic. It is one of the known faintest and lowest-mass stars.
3. Barnard's Star
It is a very low-mass red dwarf about 6 light-years away from Earth in the constellation of Ophiuchus. It is named after the American astronomer E. E. Barnard.
2. Alpha Centauri A & B
It is the second closest to the solar system, being 4.34 light-years (1.34 pc) from the Sun. It consists of three stars: Alpha Centauri A (also named Rigil Kentaurus) and Alpha Centauri B (also named Toliman), which is the binary star Alpha Centauri AB, and a small and faint red dwarf, Alpha Centauri C (also named Proxima Centauri ).
1. Proxima Centauri
It is a red dwarf, a small low-mass star, about 4.244 light-years (1.301 pc) from the Sun in the constellation of Centaurus. It was discovered in 1915 by Robert Innes.
