er of about 1,392,000 km, about 109 times that of Earth, and its mass  accounts for about 99.86% of the total mass of the Solar System. Chemically, about three quarters of the Sun"s mass consists of hydrogen, while the rest is mostly helium. The remainder (1.69%, which nonetheless equals 5,628 times the mass of Earth) consists of heavier elements, including oxygen, carbon, neon and iron, among others.</p>

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                            <span class="nature">Nature</spa