Sirius is highly visible in the Northern Hemisphere winter night sky because it has a high relative luminosity to other stars, and it's relatively close to Earth (8.6 light-years). If the star were placed next to Earth's sun, Sirius would outshine it more than 20 times over.
Arcturus is part of the Arcturus Stream, a group of ancient stars which move at a different angle and at a greater speed than other stars in our galaxy. The Arcturus Stream is thought to be the remnants of a dwarf galaxy that collided with the Milky Way.
Below is an ordered list of the largest stars currently known by radius. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,288 mi). The exact order of this list is very incomplete, as great uncertainties currently remain, especially when deriving various important parameters used in calculations, such as stellar luminosity and effective temperature.
In science fiction, Rigel's name is on a a number of planets in the "Star Trek" universe, is mentioned in "The Hitchhiker's Guide to the Galaxy," and also features in a number of novels, computer games and comic books. Rigel before modern astronomy. Rigel's name comes from an Arabic phrase, Rijl Jauzah al Yusrāʽ.
Only a few useful supergiant stars can be occulted by the Moon, including Antares and Aldebaran. Examples of eclipsing binaries include Epsilon Aurigae, VV Cephei, HR 5171, and the red-giant binary system KIC 9246715 in the constellation of Cygnus.
Complex issues exist in determining the true radii of the largest stars, which in many cases do display significant errors. The following lists are generally based on various considerations or assumptions that include: Largest stars are usually expressed in units of the solar radius (R ☉), where 1.00 R ☉ equals 695,700 kilometres.