The Sun is 5 billion years old. The Sun is mainly made up of hydrogen
and helium gases. The Sun is 1.4 km (870.000 miles) wide. It contains 750 times the mass
of all its planets put together and has 7 times the mass of the average star. Its core
consists of energy. Nuclear reactions convert mass into electromagnetic radiation,
producing the energy in the core of the Sun. This energy is what makes the Sun shine. All
of the planets in our Solar System is held together in the Suns gravity.
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