rewriting work -- 6hrs
re.bertyh.elpsfuben.t
COMM110Week3.pptxLife cycle of An average Star
OVERVIEW
WHAT IS A STAR?
STAR CLASSIFICATIONS
STELLAR NEBULA
AVERAGE STAR
RED GIANT
PLANETARY NEBULA
WHITE DWARF
WHAT IS A STAR?
A STAR IS A MASSIVE LUMINOUS (ULTRA BRIGHT) BALL OF GAS HELD TOGETHER BY GRAVITY. THE TYPE OF GAS THAT IS HELD TOGETHER IS PLASMA.
THE WAY A STAR WORKS IS A WONDER IN ITSELF, HOW IT WORKS IS THE GRAVITY IS WANTING TO SHRINK THE GAS INTO NOTHING AND THE PLASMA IS TRYING TO EXPAND AS MUCH AS POSSIBLE. WITH THESE TWO FORCES WORKING AGAINST EACH OTHER IT CAUSES A NUCLEAR FUSION WHICH IGNITES THE CORE WHICH CAUSES MORE HEAT WHICH EXPANDS FASTER THEN THE GRAVITY CAN CONTAIN, THIS IS WAY THE STAR CAN EXPAND.
STAR CLASSIFICATIONS
CLASS TEMPERATURE COLOR
O > 54,000 BLUE
B 36,000 BLUE-WHITE
A 18,000 WHITE
F 12,000 YELLOW-WHITE
G 10,000 YELLOW*
K 9,000 ORANGE
M 5,000 RED
STELLAR NEBULA
A STAR STARTS OUT AS A STELLAR NEBULA WHICH IS COSMIC DUST AND GAS COMBINING UNDER THE FORCE GRAVITY. WHEN THIS HAPPENS WE GET THE NUCLEAR FUSION WHICH IS THE “BIRTH” OF A STAR.
AVERAGE STARS
THE AVERAGE STAR, OUR SUN IS THE SECOND STAGE OF LIFE FOR THE STAR WITH A SURFACE TEMPERTURE OF AROUND 10,000 DEGREES FAHRENHEIT WITH A LIFESPAN OF AROUND 10 BILLION YEARS
RED GIANTS
RED GIANTS FORM AT THE BEGINNING OF THE END OF AN AVERAGER STAR WHEN THE CORE OF THE STAR HAS EXHAUSTED THE FUEL IT NEEDS TO BURN IN MOST CASES HYDROGEN. THE STAR STARTS TO SWELL AND ENGULF ORBITING PLANETS. THIS STAGE LASTS FOR ABOUT A MILLION YEARS.
PLANETARY NEBULA
DESPITE THE NAME THIS STAGE HAS NOTHING TO DO WITH PLANETS. DURING THIS STAGE THE STAR HAS BECOME UNSTABLE AND IS PULSATING AND THE OUTER LAYERS OF THE STAR ARE CAST OUT BY STELLAR WINDS.
WHITE DWARF
THE WHITE DWARF STAR IS THE END OF AN AVERAGE STARS LIFE. MOST OF THE STARS WE SEE NIGHT ARE THESE TYPES OF STARS. THEY ARE ABOUT THE SIZE OF THE EARTH BUT RETAIN THE COMPARABLE MASS OF A FULL SIZE SUN, BUT WITH A SURFACE TEMPERTURE OF 180,000 DEGREES FAHRENHEIT. IT WILL EVENTUALLY DISAPPEAR INTO NOTHING.
SUMMARY
WHAT IS A STAR
DIFFERENT CLASSES OF STARS
THE LIFE CYCLE OF AN AVERGER STAR
STELLAR NEBULA
AVERAGE STAR
RED GIANT
PLANETARY NEBULA
WHITE DWARF
