# Spectacular Mediocre Star

In terms of its size, mass and energy released, the sun is by far the most spectacular body in the solar system. With a radius of 22.8 x 108 feet (6.96 x 108 m), it is 100 times larger than the earth. Imagine yourself standing in a room with a golf ball. If the golf ball is the earth, the sun would touch the eight-foot ceiling. With a mass of 1.99 x 1030 kg, the sun is 300,000 times more massive than the earth. And with a surface temperature of 5,780 K (compared to the earth's average 290 K surface temperature), the sun would melt or vaporize any matter we know. Some important measurements used to express the energy output of the sun include: watt (a measure of power; the rate at which energy is emitted by an object); solar constant (the energy each square meter of the earth's surface receives from the sun per second: 1,400 watts); and luminosity (the total energy radiated by the sun per second 4 x 1026 watts).

Some important measurements used to express the energy output of the sun include: watt (a measure of power; the rate at which energy is emitted by an object); solar constant (the energy each square meter of the earth's surface receives from the sun per second: 1,400 watts); and luminosity (the total energy radiated by the sun per second 4 x 1026 watts). 