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D4 Earth, the Moon, and the Sun Sort It has extreme temperatures because there is almost no atmosphere, no water, and no life. It is approximately 4.6 billion years old. It is a rocky satellite of the Earth. It’s a geologically active planet with a surface that is constantly changing. It is the 3rd planet from the sun and one of the 4 terrestrial planets. It is 1/4 the size of the Earth and is 1/80 its mass. It is 110 times the diameter of the Earth. More than a million Earths could fit inside it. It is an average-sized yellow star. Its surface is not solid; it is made of gases like helium and hydrogen. It has an atmosphere which blocks out most of the sun’s damaging rays. It can support life because it has life–supporting water and an oxygenrich atmosphere.