According to the Sun Fact Sheet made available by NASA, the luminosity of the Sun is approximately 3.84 * 10^26 joules per second. This is the same as 3.84 * 10^26 watts. More »

The common term of measurement for luminosity is watts. Luminosity is the measure of brightness and the amount of energy a star or light emits per second. The measurement is an intrinsic measurable property that can be m... More »

Star luminosity depends upon both radius and temperature because luminosity is a measure of energy output. A larger star puts out more energy than a similar, but smaller star, just as a hotter star puts out more energy t... More »

The Sun occupies a volume large enough to contain 1.3 million Earth-size planets. The size of the Earth is insignificant compared to the Sun: It is only about the size of an average sunspot. More »

Day and night on Earth are caused by the planet's rotation around its axis and its position relative to the Sun. The Earth rotates from west to east, so places further east experience daybreak and nightfall sooner. One h... More »

In terms of radius, the Sun is about 109 times larger than Earth. The diameter of the Sun is approximately 864,948 miles while the diameter of Earth is only 7,926 miles. It is necessary to line up the Earth end-to-end 10... More »

According to the Mullard Space Science Laboratory, the most explosive events that occur on the Sun include solar flares and coronal mass ejections. Solar flares are massive eruptions of energy from the Sun's surface that... More »