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The Sun & Stars By: Shanika Bates How Big Is The Sun • The Sun is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the Solar System • diameter: 1,390,000 km • mass: 1.989e30 kg How Hot Is The Sun • The mean surface temperature of the Sun is 5506°C (9944°F) • The mean core temperature of the Sun is 15,000,000°C(27,000,032°F) How Old Is The Sun • The generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years (plus or minus about 1%). This value is derived from several different lines of evidence. How Big Is The Sun Compared To Earth • Both the Sun and the Earth are almost perfect spheres; both bulge very slightly at their equators. The Sun's equatorial diameter is 1,391,400 km; the Earth's equatorial diameter is 12,756 km. So the Sun's diameter is about 109 times that of the Earth. The Suns Structure Pictures of the sun QUIZ How Are Stars Formed And How Do They End Up • All stars are formed from nebulae (the plural of nebula). Nebula is a term for a cloud of gas, and stars form from gas. • They are expected to supernova, stars less massive than this (like our Sun, of course) become white dwarfs. After a supernova, there may be nothing left, or there could be a remnant: either a neutron star or a black hole. What Are Stars Made Of • Basically, stars are big exploding balls of gas, mostly hydrogen and helium. Our nearest star, the Sun, is so hot that the huge amount of hydrogen is undergoing a constant star-wide nuclear reaction, like in a hydrogen bomb. Even though it is constantly exploding in a nuclear reaction, the Sun and other stars are so large and have so much matter in them that it will take billions of years for the explosion to use all the "fuel" in the star. The Polaris And Constellations Pictures Of Stars Is The Sun A Star • Yes, The Sun is a medium size star known as a yellow dwarf. It is a star in the Milky Way galaxy A Fact About The Sun You Might Not Have Known • Many ancient peoples worshiped the Sun as a god. They thought a solar eclipse meant the god was angry with them. They believed the Sun god's anger could only be calmed with prayer and sacrifice. Why Stars Shine So Bright • Stars are large, very hot (therefore very bright) spheres of plasma - the heat and light is generated by nuclear fusion of hydrogen to helium in the star's core. But not all stars are very bright - some are dim (red dwarfs for example) that can't be seen with the naked eye. And if we were more than about 25 light years away, we wouldn't be able to see the sun without a telescope. My Fact Page • Earth107 × 1.27 m1 x =Sun109 × 1.39 m100 x (closer to 110) • It’s the color of lava • It has no moons • No satellites are around it • I does not rotate REFRENCES • • • • www.ask.com www.google.com www.picsearch.com ……that’s it