Posted in Geography, Our Solar System

Our Solar System : The Sun

1. The sun is one of more than 100 billion stars in the – Milky Way

2. The Sun is the star at the center of the – Solar System

3. Sun is the most important source of energy for life on – Earth

4. The Sun alone contains 99.8% of the total mass in the – Solar System

5. The Sun is, at present, about – 70% hydrogen and 28% helium by mass

6. There are eight planets and a large number of smaller objects orbiting – the Sun

7. Each second about 700,000,000 tons of hydrogen is converted to about – 695,000,000 tons of helium and 5,000,000 tons of energy in the form of gamma rays

8. The Sun’s magnetic field is very – strong and very complicated

9. The energy created by the Sun’s core is – nuclear fusion

10. The Sun is travelling at – 220 km per second

11. It takes eight minutes for light reach Earth from – the Sun

12. The Sun rotates in the opposite direction to – Earth with the Sun rotating from west to east instead of east to west like Earth

13. The atmosphere of the Sun is composed of – Three layers (the photosphere, the chromospheres, and the corona)

14. The Sun is classified as a – yellow dwarf star

15. Many scientists think the sun and the rest of the solar system formed from a – giant, rotating cloud of gas and dust known as the solar nebula

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