00:01
Speed of light is 2 .998 times 10 to 8 meters per second.
00:05
And a light year is the distant light travels in one year.
00:11
So how many meters are there in one light year? so this is the speed of light.
00:17
We're going to figure out what it is in years.
00:21
There's 60 seconds in one minute and 60 minutes in one hour.
00:29
There's 24 hours in one day.
00:34
We got 365 .25 days per year.
00:45
So that would give us meters per year.
00:49
So if we multiply the top, all the bottom denominators are one.
00:53
So our numerator is 5 .67 and we're going to round it to 7 times 10 to the 17 meters.
01:03
The reason we're going to round to four significant digits is because we have four significant digits up here, and that would be meters per year.
01:14
So the question was how many meters in one light year would be 5 .67 times 10 to the 17.
01:23
So we are told that one astronomical unit is equal to 1 .50 times 10 to the 8 kilometers.
01:29
And we need to know how many a .u...