FACTOID # 29: 73.3% of America's gross operating surplus in motion picture and sound recording industries comes from California.
 
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Encyclopedia > Milliarcsecond

A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. Astronomical distances to stars are sometimes given in mas, such as in the Hipparcos catalogue. This unit can be converted to parsecs (pc) by taking the inverse: 1000 mas = 1/pc


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Diameters of stars (993 words)
For the Keck telescope, 10 meters in diameter, the resolution at wavelengths used by the human eye is only 20 milliarcsecond (0.02 arcseconds).
For reference, a person standing on the moon would have an angular height of 1.0 milliarcseconds.
The largest star shown, Hamal, also known as alpha Cassiopeiae, is 6.88 milliarcseconds in diameter.
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