Quote:
Originally Posted by Hamlet53
light year = ~186,000 mi/s x 60x60x24x365 = ~ 5.9 x 10^12 miles?
1 parsec = 2.1 light year?
AU = mean distance between sun an earth?
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One point for the light year distance. To two significant digits you're exactly right. (To five digits it's 5.8785 x 10^12 miles.)
Right order of magnitude, but well outside 10% for the parsec.
1 point for the definition of AU.
That's 3.5 points to Hamlet53 with only three points remaining.
Over to you, Hamlet53!
(An AU is approx. 93 million miles. A parsec is the distance at which a disk of one AU diameter subtends one second of arc, about 3.3 light years.)