Also Known As: Alpha Centauri C
Distance From Earth: 4.2 light years
Star Type: Red Dwarf - M Class
Mass: 12% of the Sun
Luminosity: 0.17% of the Sun
Diameter: 120,000 miles (193,000 km) - 14% of the Sun
Temperature: Approx 3,000C (5,400F)
Age: Approx 5 billion years old
Rotation Period: 84 days
At 4.2 light years away Proxima Centauri is the nearest star to the sun, but as it is so small and dim it cannot be viewed with the naked eye.
The star can be found in the Centaurus constellation, a centaur is a Greek mythological half man half horse creature, proxima is Latin for next or nearest.
The red dwarf Proxima Centauri is part of the three star Alpha Centauri system, the other two stars, Alpha Centauri A and B, are similar to our own sun.
Proxima Centauri is extremely distant from its two companions, orbiting them at a distance of around 1.2 trillion miles (1.9 trillion km).
Stars like our sun exist for a few billion years, red dwarfs like Proxima Centauri burn their fuel at a much lower rate and can therefore exist far longer.
In August 2016 it was announced that an Earth sized planet had been discovered orbiting the habitable zone around Proxima Centauri, the planet named Proxima b could possibly have liquid water on its surface.
Proxima b is the closest known planet outside our solar system.
The star Proxima Centauri was discovered in 1915 by the Scottish born astronomer Robert Innes.
1. Sirius is a two-star system within 8.6 light years from Earth in the constellation Canis Major.
2. The star system consists of a main sequence star Sirius A and Sirius B. The white dwarf star
3. Sirius B is a white dwarf star that is closest to the Earth.
4. The force of gravity on Sirius B 350,000 times stronger than on Earth, which means 3 grams of material (roughly like a sugar cube) will have a weight of 1,000 kilograms (2,200 pounds) in this star.
5. Sirius is the brightest star in the night sky and the closest that can be seen without a telescope.
6. Sirius A has a radius of 740,000 miles (1.2 million km), 71% larger than the radius of the sun, Sirius B has a radius of only 3,650 km (5,900 km), which makes it slightly smaller than the planet Earth!
7. Sirius A has a mass of 2 times larger than the Sun, though Sirius B is smaller than the Earth, Sun-like star's mass.
8. Sirius A is estimated to have a surface temperature of about 9,940 K or about 10000 C (18,000 F), nearly two times more heat from the sun, Sirius B has a surface temperature of about 25.000C (45,000 F), nearly five times hotter than the sun.
9. Sirius B has a highly elliptical orbit around its companion star is greater.
10. The name Sirius comes from the Greek Σείριος (Seirios, which means "fire" or "very hot"). While the Egyptians also knew of the star around 4000 BC.