A
light-year, also light
year or lightyear (symbol: ly), is a unit of length equal to just under 10 trillion kilometres (or about 6
Kaynak: Light-yearIn astronomical terms, it is equal to 3.26
light-year s, and in scientific terms it is equal to 3.09 13 kilometres (1.92 13 miles).
Kaynak: Parsecis a spiral galaxy approximately 2.5 million
light-year s (2.4 19 km) from Earth in the Andromeda constellation . Also known as Messier
Kaynak: Andromeda GalaxyThe Milky Way is a barred spiral galaxy 100,000–120,000
light-year s in diameter containing 200–400 billion stars . It may contain at
Kaynak: Milky Waycenter of the Milky Way at a distance of approximately 24000–26000
light-year s from the galactic center , completing one clockwise orbit ,
Kaynak: SunThese globular clusters orbit the galaxy out to large radii, 40 kiloparsecs (approximately 131,000
light-year s) or more. Every galaxy of
Kaynak: Globular clusterwhich corresponds to a proper distance of approximately 29 billion
light-year s from Earth (see more discussion of how cosmological
Kaynak: Quasarperiod comets and to surround the Solar System at roughly 50,000 AU (around 1
light-year (ly), and possibly to as far as 100,000 AU (1.87 ly).
Kaynak: Solar System163,000
light-year s the LMC is the third closest galaxy to the Milky Way, with the Sagittarius Dwarf Spheroidal (~ 16 kiloparsecs) and
Kaynak: Large Magellanic CloudConversion factors : 1
light-year ≈ 63,241.077 AU 1 parsec 648,000/π ≈ 206,264.8 AU See also: Time. Orders of magnitude (length) Notes and
Kaynak: Astronomical unitProxima Centauri (Latin la | proxima, meaning "next to" or "nearest to is a red dwarf star about 4.24
light-year s distant inside the
Kaynak: Proxima CentauriThe parsec (3.26
light-year s) is defined as the distance for which the annual parallax is 1 arcsecond . different times of the
year as
Kaynak: ParallaxAstronomical distances are sometimes expressed in
light-year s, especially in popular science publications and media A
light-year is the
Kaynak: Speed of lighthypothesized spherical cloud of predominantly icy planetesimal s that may lie roughly 50,000 AU , or nearly a
light-year , from the Sun .
Kaynak: Oort cloudAt a distance of just under 12
light-year s from the Solar System , it is a relatively nearby star , and is the closest solitary G-class
Kaynak: Tau Cetior ˈ | k | æ | ŋ | k | r | iː), also cataloged Rho 1 Cancri or abbreviated 55 Cnc, is a binary star approximately 41
light-year s away
Kaynak: 55 CancriUpsilon Andromedae (υ Andromedae, υ And) is a binary star located approximately 44
light-year s away from Earth in the constellation
Kaynak: Upsilon AndromedaeGliese 876 is a red dwarf star approximately 15
light-year s away from Earth in the constellation of Aquarius . It is the fourth closest
Kaynak: Gliese 876Messier 32 (also known as NGC 221 and Le Gentil ) is a dwarf elliptical galaxy about 2.65 million
light-year s away in the constellation
Kaynak: Messier 32