How far away is a light year?
1 lightyear = 9.4605284 × 10^15 meters a lightyear is the distance light can travel in one year's time, and all electromagnetic waves travel at 3x10^8 m/s, so: 3x10^8 m/s * (60*60*24*365) s/yr = 9.46x10^15 m/yr
light speed c= 310^8m/s In a year , number of seconds 365*24*60*60 =3.1536*10^7 so 3*10^8*3.153610^7=9.46 10^15m = 9.4310^12 km
A light year is the distance light travels in one year. 1 year * (365 days/year) (24 hr/day) (3600 s/hr) = 3.15 x 10^7 s 3.0 x 10^8 m/s * 3.15 x 10^7 s = 9.46 x 10^15 m 9.46 x 10^15 m * (1 km/1000m) = 9.46 x 10^12 km So, one light year is about 9.5 trillion kilometers.
You constantly stand at one end of a light year, so you could say: As close as the floor. Seriously, the other answers give the actual length of a light year (IAU Style Manual has an exact value of 9,460,730,472,580,800 metres), but how far away? Are you looking for a body about 1 ly out? If so, the Oort cloud is approximately 2 light-years in diameter and therefore just under a lightyear from Earth to its outer edge.
A light-year is equal to: 9,460,730,472,580.8 km (about 9.461 Pm) about 5,879,000,000,000 statute miles about 63,240 astronomical units about 0.3066 parsecs
