Ask Astro: Could Jupiter ever become a star?
Jupiter’s mass is about 4.17 x 1027 pounds (1.89 x 1027 kilograms); the Sun’s mass is about 4.27 x 1030 pounds (1.98 x 1030 kg), or about 1,048 times the mass of Jupiter. An alternative way of expressing this is Jupiter weighs less than 0.1 percent the Sun’s mass.

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