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Slide 1:

STAR AND ITS EVOLUTIONARY THEORY

Slide 2:

HUBBLE

Slide 3:

HUBBLES TELESCOPE

Slide 4:

TOPICS TO BE DISCUSSED 1.WHAT IS A STAR? 2.INTRESTING FACTS ON STARS 3.HOW DO WE EXPRESS DISTANCE OF STARS 4.TYPES OF STARS 5.LIFE CYCLE OF STARS 6.CONCLUSION

Slide 5:

WHAT IS A STAR?

Slide 6:

A STAR IS TERRESTRIAL BODY WHICH EMITS CONTINOIUS RADIATIONS BASED ON THE PRINCIPLE OF NUCLEOSYNTHESIS

Slide 7:

2.THE SIZE OF SMALLEST ONE IS 0.08 THE SIZE OF THE SUN INTRESTING FACTS ON STARS 1.NO TWO STARS LOOK LIKE 2.THE SIZE OF SMALLEST ONE IS 0.08 THE SIZE OF THE SUN 3. THE COLOUR OF THE STAR MAY BE RED YELLOW OR BLUE 4.IT TAKES ABOUT NEARLY 4.5 LIGHT YEARS TO REACH THE NEAREST STAR 5. THEY MAINTAIN A SURFACE TEMPERATURE OF 15000K

Slide 8:

HOW DO WE EXPRESS DISTANCE IN STARS 1.THE DISTANCE IS MEASURED IN ASTRONOMICAL UNIT CALLED LIGHT YEAR 2.1 LIGHT YEAR=9,460,000,000,000Km 3.THE ANOTHER UNIT OF DISTANCE COMMONLY USED BY ASTRONOMERS IS THE PARSEC(PARALLAX-SECOND) 4.1pc=2.093 *10,000AU

Slide 11:

AMOUNG THESE THE MOST IMPORTANT TYPES ARE: 1.O TYPE 2.B TYPE 3.G TYPE 4.M TYPE

Slide 12:

O TYPE

Slide 13:

B TYPE

Slide 14:

G TYPE

Slide 15:

M TYPE

Slide 16:

DIFFERENT TYPES OF STARS

Slide 17:

BIRTH OF A STAR

Slide 18:

LIFE CYCLE OF STARS SMALL STARS HAVING MASS LESS THAN 2 TIMES THE MASS OF THE SUN: 1.NEBULA 2.PROTOSTAR 3.MAIN SEQUENCE STAR 4.RED GAINT 5.PLANETERY STAR 6.WHITE DWARF 7.BLACK DWARF

Slide 19:

NUBELA

Slide 20:

PROSTARS

Slide 21:

MAIN SEQUENCE STAR

Slide 22:

RED GAINT STAR

Slide 23:

PLANETERY NEBULA

Slide 24:

WHITE DWARF

Slide 25:

BLACK DWARF

Slide 26:

BUT IF THE MASS OF THE STAR IS GREATER THAN 2 TIMES THE MASS OF THE SUN:[CHANDRA SEKHAR LIMIT] 1.RED SUPER GAINT 2.NEUTRON STAR 3.BLACK HOLE

Slide 27:

PROF.CHANDRA SEKHAR WON NOBEL PRIZE FOR HIS STUDY ON STARS AND BLACK HOLES

Slide 28:

RED SUPER GAINT

Slide 29:

NEUTRON STAR

Slide 30:

BLACK HOLE

Slide 31:

CONCLUSION STARS ARE NOT JUST TINY PARTS OF SKY.THEY ARE THE WORLDS GREATEST MYSTERIES.THESE MYSTERIES ARE THE CHALLENGE TO THE HUMAN HISTORY

Slide 32:

THANK YOU

Slide 33:

DONE BY Y.SAI MANOHAR. EEE,BVRIT

Slide 34:

MAINLY STARS ARE DIVIDED INTO 7 TYPES…THEY ARE O-B-A-F-G-K-M.. THIS CAN BE EASILY REMEMBERED AS “ OH BE A FINE GIRL, KISS ME..

Slide 35:

WHAT IS A STAR?

Slide 36:

TYPES OF STARS MAINLY STARS ARE DIVIDED INTO 7 TYPES…THEY ARE O-B-A-F-G-K-M.. THIS CAN BE EASILY REMEMBERED AS "OH BE A FINE GIRL, KISS ME.."