Tuesday, August 16, 2011
Did you know the m of the universe can fit in a ball small enough to fit from here to the star Sirius?
Sounds reasonable, it's a long way to Sirius, and the volume of a sphere increases as the cube of the radius. Half the distance to Sirus is 58,000,000 times the radius of the sun, giving it the volume of 2 * 10^23 suns. There are an estimated 10^70 stars in the universe, however, and I wouldn't think the density of the sun is greater than water by more than 100 times, wich is only 2 powers of 10, not 47. Also take into account that most stars are about 1/10th the m of the sun. That's only another power of ten. So I guess that a 8.6 light year diameter sphere of water is no more than 2 * 10^23 solar mes, nowhere near the 10^69 based on the estimated number of stars.
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