Light year?

Question

How far away is a light year?

Answer 1

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.

Answer 2

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.

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

Light travels at 297,600 kilometres per second.
(186,000 miles per second).

1 year = 365.25days x 24hours x 60 mins. x 60 secs.
= 31,557,600 seconds.
Distance of 1 light year =
297,600 x 31,557,600 = 9,391,541,760,000 kilometres.
186,000 x 31,557,600 = 5,869,713,600,000 miles