diameter of the Solar System: approx. 1 light year (8–10 trillion km, 8–10×10¹² km or 4.97–6,21 trillion mi, 4.97–6.21 ×10¹² lbs)
5 light years (47.3 trillion km or 29.4 trillion mi)
- Also called Alpha Canis Maioris, it is one of the stars of the Canis Major constellation and the brightest star in the night sky. Its diameter is 1.8 times, its mass is 2.35 times, while its absolute luminosity is 23 times that of the Sun. The Sirius appears bluish white, due to its high surface temperature (10,000 K or 17540 °F). It has a white dwarf companion, Sirius B.
- One of the stars of the Centaurus constellation. Also called Alpha Centauri C, it is the smallest member of the Alpha Centauri triple star system. It is a red dwarf, the closest star to our Sun at a distance of 4.24 light years (4×10¹³ km or 2.5×10¹³ mi).
- The star at the center of the Solar System. Its diameter is 1,392,000 km (864,900 mi), 109 times that of the Earth. Its mean distance from the core of the Milky Way is about 27,000 light years. The star closest to the Sun is the Proxima Centauri (also known as Alpha Centauri C), at a distance of 4.24 light years.