By :- Aritra Roy (Roll No- 07) Nirban Goswami (Roll No- 08) Jishnu Prasad Sen (Roll No- 09)

IMPORTANT FACTS RELATED SUN :-

LIFE CYCLE OF SUN :-

•Sun is a young star. It is in the middle of yellow dwarf stage.

INTERNAL STRUCTURE OF SUN SHOWING RADIATIONS :-

SURFACE OF SUN: Average temperature – 100,000 K

Radiations coming out from the surface of Sun:-

Actual view of Sun: Taken by Helios 1 Satellite

THE EFFECTS OF THE SUN ON THE EARTH:

THE POSITIVE EFFECTS:

1. THE SUNLIGHT IS NECESSARY FOR PHOTOSYNTHESIS.

2. THE SUNLIGHT IS CONVERTED INTO ELECTRICAL POWER BY

THE SOLAR CELLS.

3. USING UV RAY,COMING FROM THE SUN, WE SANITIZE TOOLS

AND WATER.

4. THE SUNLIGHT IS USEFUL FOR HUMANBODY AS VITAMIN-D IS PRODUCED ON THE SKIN SURFACE OF HUMANBODY.

THE ADVERSE EFFECTS:

1.THE EXTRA AMOUNT OF UV RAY IS HARMFUL TO HUMANBODY AS WELL AS THE RETINA OF HUMAN EYES.

2.SUNLIGHT IS VERY BRIGHT AND LOOKING DIRECTLY AT THE SUN WITH THE NAKED EYES FOR BRIEF PERIODS CAN BE PAINFUL AND HAVE TEMPORARY PARTIAL BLINDNESS.

•SOME OTHER EFFECTS:

1.THE SUN CAUSES THE SEASONS ON THE EARTH.

2.THE SUN CAUSES THE CHANGE OF THE STRUCTURE OF EARTH’S OUTER ATMOSPHERE.

3.SUN CAUSES THE HUMAN SKIN COLOUR IN DIFFERENT REGIONS OF THE GLOBE.

THE END