THE SUN
The Sun, the star closest to earth, anchors our solar system. It seems immense to us, but compared with other stars, it is only average in size. For example , Alpha Orionis in the constellation Orion, commonly known as Betelgeuse, is almost 400 times bigger than-and 10,000 times times brighter than-the sun. Still, if the sun were hollow, a hundred Earths could fit inside.
HISTORY ABOUT SUN
Like all stars the Sun is a ball of hydrogen gas that radiant heat and light. It generates power by nuclear fusion: Atoms are rammed together , producing nuclear energy. Every second, the converts some four millions tons of matter into energy.
Earth orbits the sun at a distance ideal for terrestrial life, provided that Earth's atmosphere protects us from the sun's heat deadly radiation.
The sun is a third generation star, composed of recycle elements from two previous stars. It is about 74 percent hydrogen and 25 percent helium, with traces of iron, calcium and sodium. These same elements are found in planet Earth and our bodies.
FAST FACTS
THE SUNS ACCOUNT FOR 99 PERCENT OF
THE TOTAL MATTER IN OUR SOLAR
SYSTEM.
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