A binary star is a star system consisting of two stars orbiting around their common barycenter.
Cancer is one of the twelve constellations of the zodiac.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
The following two lists include all the known stars and brown dwarfs that are within of the Sun, or were/will be within in the astronomically near past or future.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
The Sun is the star at the center of the Solar System.
The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.