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You must have miscalculated Betelgeuse's angular size. Remember the
relationship between an object's angular size and its physical size and
distance. If the physical size is in km (don't forget to convert from cm!)
and the distance is in parsecs, the angular size is in arcseconds if you
multiply by a factor of 6.7 x 10-9. If you are having problems
measuring Betelgeuse' size, print the page out and use the printed version
to make your measurements. The edge of the
star
is somewhere in the orange, as opposed to the red, area of the image. Check your math carefully and
try your calculation again.
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