| http://www.w3.org/ns/prov#value | - Image Credit: University of Montreal Scientists were able to measure the A1's mass by using its companion star (a binary system that two orbit a common center of gravity), and used A1's orbit data, the two stars' Doppler shift, and the eclipses made by the stars, all to help figure out the mass.Scientists have believed that the largest a star can reach is 150 solar masses, and this new discovery h
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