Posted by KD on Tuesday, September 13, 2011 at 5:07am.
Few question about astronomy:
1.how many centimetres is equivalent to a lightnanosecond
2. How long is an astronomical unit (AU) in lightminutes (1min, i.e., the distance that light travels in a vacuum in one minute)?
Please show the calculation if there is any
Thanks

Astronomy  bobpursley, Tuesday, September 13, 2011 at 5:28am
1. speedlight*time= distance
3E8m/s*1E2cm/m*1E9sec=3E1 or 30 cm
2. speedlight*time=distance
3E8m/s*60sec= ?

Astronomy  drwls, Tuesday, September 13, 2011 at 7:01am
2. Sunlight reaches Earth in 8.3 minutes. The EarthSun distance is therefore 8.3 lightminutes.
One way to get the answer is to divide the EarthSun distance by the distance travelled by light in one minute, using the same units.
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