Since their total gravity would be stronger, the length of a year would be a bit less: about 280 days instead of 365 days. The combined mass of Sun 1 and Sun 2 would be 1.7 times the mass of our current sun. A 15% mass reduction is enough to cut a star’s brightness in half. Roughly speaking, luminosity goes as the 4th power of mass, so doubling the mass of a star increases its brightness by a factor of 16 (2x2x2x2). That may seem surprising, but the luminosity of a star is extremely sensitive to mass. The mass of each of our new suns (I’ll call them Sun 1 and Sun 2) would be about 85% of the mass of our current sun.
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