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You're a factor of 2 out in your answer...
1 light year = 9.4605284 x 10^18mm
Aldebaran = 65.1 light years away
65.1 x 9.4605284 x 10^18
= 6.159 x 10^20 (not 11)
Diametre of Aldebaran is approx. 61 million km
19.41/6.1 x 10^12mm
= 3.18 x 10^-13 (not 12)
6.159 x 10^20 x 3.18 x 10^-13
= 1.958 x 10^8mm (195,856,200mm)
= 1.9585 x 10^2 km
= 195.85km
Last edited by renormalised; 14-12-2011 at 12:13 AM.
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