The Sun is a main sequence star located right at the center of our Solar System. It holds 99.8 percent of the solar system’s mass. It is nearly a perfect sphere with a diameter of around 1,392,684 kilometers. It has a surface temperature of around 5,500 degree Celsius and the temperature at its core can reach up to 27 million degree Celsius.
NAME: …………………………………………
Date: …………………………….
Questions:
1. The Sun is estimated to be ………………………….years old by scientists.
2. The black spots on the Sun that can be seen by the naked eye are called ………………………………………
3. The mass of Sun is …………………………….times that of the earth.
4. It is called ………………………………………. When the moon is directly between the earth and the Sun.
5. Sunlight takes ……………………. Minutes to reach the Earth.
6. The Sun’s atmosphere is composed of three layers which are ……………………………….., ……………………………………. and ………………………………..
7. The Sun takes ………………………..to complete one rotation around its axis.
8. ………………………………………is a spacecraft which has ever come the closest to the Sun.
9. Aurora Australis in the Southern Hemisphere is caused by …………………………………
10. The spectral type of the sun is …………………………
Answers:
1. 4.5 billion years
2. Sun spots
3. 333,000
4. Solar Eclipse
5. Eight
6. Photosphere, chromosphere and corona
7. 25 days
8. Helios 2
9. Solar flares
10. G2