The Sun is an average yellow star at the center of our Solar System composed of glowing hydrogen and helium gases. Chromosphere, and Corona.
The Earth is a planet that orbits third from the Sun. The size of the Earth is 1/100 the diameter of the Sun, but four times the diameter of the Moon. Unlike the Sun, whose gravity pulls the entire Solar System around it, only one moon revolves around Earth. Unlike the Sun, the Earth and Moon do not give off their own heat and light, but reflect sunlight.
The Moon is the Earth’s only natural satellite. Planet Earth is the first inner planet to have a moon (Mercury and Venus have no moons). Earth is the only planet to have just one moon; Mars has two moons and the gas giants have huge numbers of moons. The Moon is ¼ the diameter of Earth, has 1/6 the gravity of Earth, and orbits the Earth once a month (about every 29 days). The surface of the Moon shines by reflected sunlight as does the Earth.
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