light-year | 1 ly | 2 ly | 3 ly | 4 ly | 5 ly | 6 ly | 7 ly | 8 ly | 9 ly | 10 ly | 11 ly | 12 ly | 13 ly | 14 ly | 15 ly | 16 ly | 17 ly | 18 ly | 19 ly | 20 ly | 21 ly | 22 ly | 23 ly | 24 ly | 25 ly | 26 ly | 27 ly | 28 ly | 29 ly | 30 ly | 31 ly | 32 ly | 33 ly | 34 ly | 35 ly | 36 ly | 37 ly | 38 ly | 39 ly | 40 ly | 41 ly | 42 ly | 43 ly | 44 ly | 45 ly | 46 ly | 47 ly | 48 ly | 49 ly | 50 ly | 51 ly | 52 ly | 53 ly | 54 ly | 55 ly | 56 ly | 57 ly | 58 ly | 59 ly | 60 ly | 61 ly | 62 ly | 63 ly | 64 ly | 65 ly | 66 ly | 67 ly | 68 ly | 69 ly | 70 ly | 71 ly | 72 ly | 73 ly | 74 ly | 75 ly | 76 ly | 77 ly | 78 ly | 79 ly | 80 ly | 81 ly | 82 ly | 83 ly | 84 ly | 85 ly | 86 ly | 87 ly | 88 ly | 89 ly | 90 ly | 91 ly | 92 ly | 93 ly | 94 ly | 95 ly | 96 ly | 97 ly | 98 ly | 99 ly | 100 ly |
foot | 3.1038479018633 × 1016 ft | 6.2076958037266 × 1016 ft | 9.31154370559 × 1016 ft | 1.2415391607453 × 1017 ft | 1.5519239509317 × 1017 ft | 1.862308741118 × 1017 ft | 2.1726935313043 × 1017 ft | 2.4830783214907 × 1017 ft | 2.793463111677 × 1017 ft | 3.1038479018633 × 1017 ft | 3.4142326920497 × 1017 ft | 3.724617482236 × 1017 ft | 4.0350022724223 × 1017 ft | 4.3453870626086 × 1017 ft | 4.655771852795 × 1017 ft | 4.9661566429813 × 1017 ft | 5.2765414331676 × 1017 ft | 5.586926223354 × 1017 ft | 5.8973110135403 × 1017 ft | 6.2076958037266 × 1017 ft | 6.518080593913 × 1017 ft | 6.8284653840993 × 1017 ft | 7.1388501742856 × 1017 ft | 7.449234964472 × 1017 ft | 7.7596197546583 × 1017 ft | 8.0700045448446 × 1017 ft | 8.380389335031 × 1017 ft | 8.6907741252173 × 1017 ft | 9.0011589154036 × 1017 ft | 9.31154370559 × 1017 ft | 9.6219284957763 × 1017 ft | 9.9323132859626 × 1017 ft | 1.0242698076149 × 1018 ft | 1.0553082866335 × 1018 ft | 1.0863467656522 × 1018 ft | 1.1173852446708 × 1018 ft | 1.1484237236894 × 1018 ft | 1.1794622027081 × 1018 ft | 1.2105006817267 × 1018 ft | 1.2415391607453 × 1018 ft | 1.272577639764 × 1018 ft | 1.3036161187826 × 1018 ft | 1.3346545978012 × 1018 ft | 1.3656930768199 × 1018 ft | 1.3967315558385 × 1018 ft | 1.4277700348571 × 1018 ft | 1.4588085138758 × 1018 ft | 1.4898469928944 × 1018 ft | 1.520885471913 × 1018 ft | 1.5519239509317 × 1018 ft | 1.5829624299503 × 1018 ft | 1.6140009089689 × 1018 ft | 1.6450393879876 × 1018 ft | 1.6760778670062 × 1018 ft | 1.7071163460248 × 1018 ft | 1.7381548250435 × 1018 ft | 1.7691933040621 × 1018 ft | 1.8002317830807 × 1018 ft | 1.8312702620994 × 1018 ft | 1.862308741118 × 1018 ft | 1.8933472201366 × 1018 ft | 1.9243856991553 × 1018 ft | 1.9554241781739 × 1018 ft | 1.9864626571925 × 1018 ft | 2.0175011362112 × 1018 ft | 2.0485396152298 × 1018 ft | 2.0795780942484 × 1018 ft | 2.1106165732671 × 1018 ft | 2.1416550522857 × 1018 ft | 2.1726935313043 × 1018 ft | 2.203732010323 × 1018 ft | 2.2347704893416 × 1018 ft | 2.2658089683602 × 1018 ft | 2.2968474473789 × 1018 ft | 2.3278859263975 × 1018 ft | 2.3589244054161 × 1018 ft | 2.3899628844348 × 1018 ft | 2.4210013634534 × 1018 ft | 2.452039842472 × 1018 ft | 2.4830783214907 × 1018 ft | 2.5141168005093 × 1018 ft | 2.5451552795279 × 1018 ft | 2.5761937585466 × 1018 ft | 2.6072322375652 × 1018 ft | 2.6382707165838 × 1018 ft | 2.6693091956025 × 1018 ft | 2.7003476746211 × 1018 ft | 2.7313861536397 × 1018 ft | 2.7624246326584 × 1018 ft | 2.793463111677 × 1018 ft | 2.8245015906956 × 1018 ft | 2.8555400697143 × 1018 ft | 2.8865785487329 × 1018 ft | 2.9176170277515 × 1018 ft | 2.9486555067702 × 1018 ft | 2.9796939857888 × 1018 ft | 3.0107324648074 × 1018 ft | 3.0417709438261 × 1018 ft | 3.0728094228447 × 1018 ft | 3.1038479018633 × 1018 ft |
The light-year is a unit of length used to express astronomical distances. It is about 9.5 quadrillion metres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
light-year | ly | ≡ Distance light travels in vacuum in 365.25 days | = 9.4607304725808×1015 m | Science - Astronomy (Length) |
light-years | feet | light-years | feet |
---|---|---|---|
1 | = 3.1038479018633E+16 | 4 | = 1.2415391607453E+17 |
1.5 | = 4.655771852795E+16 | 4.5 | = 1.3967315558385E+17 |
2 | = 6.2076958037266E+16 | 5 | = 1.5519239509317E+17 |
2.5 | = 7.7596197546583E+16 | 5.5 | = 1.7071163460248E+17 |
3 | = 9.31154370559E+16 | 6 | = 1.862308741118E+17 |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
feet | light-years | feet | light-years |
---|---|---|---|
1 | = 3.2218073553143E-17 | 4 | = 1.2887229421257E-16 |
1.5 | = 4.8327110329714E-17 | 4.5 | = 1.4498133098914E-16 |
2 | = 6.4436147106285E-17 | 5 | = 1.6109036776571E-16 |
2.5 | = 8.0545183882857E-17 | 5.5 | = 1.7719940454228E-16 |
3 | = 9.6654220659428E-17 | 6 | = 1.9330844131886E-16 |
light-years | feet |
---|---|
1 | = 3.1038479018633 × 1016 |
3.2218073553143 × 10-17 | = 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |