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Evolution of Stars
Main Factor of Life CycleBeginning mass
Nebulae Huge clouds of dust and gas
M16 – Eagle Nebula
M16 – Eagle Nebula
Stars forming in Trifid Nebula M20
½ light year long twisters in Lagoon Nebula M8 in Sagittarius
Protostar Hot, contracting cloud of dust and gases
When the temp. reaches 10,000,000 °C, a star is born
Star forming region in NCG 2366
Star forming region of NCG604
Medium-sized Stars Most common star type Our sun
Red Giant Most of the hydrogen is used up Outer shell begins to expand
As it expands, it cools and becomes red
Core gets hotter – up to 200,000,000 °C – where helium is fused into carbon
Gas drifts off forming a planetary nebula
Eskimo Nebula – NCG2392
MyCn18 – young planetary nebula 8000 light years away
Stingray Nebula – youngest nebula known
Ring Nebula – planetary nebula around a white dwarf
White Dwarf Extremely dense White hot
M4 – comparison of ground based observation to HST
Massive Stars Start like medium-sized starsBecome supergiants after red giant stage
Temp can reach 600,000,000 °C Carbon atoms fuse and eventually form iron
Betelgeuse – red supergiant
Supernova Tremendous explosion Heat can reach 1,000,000,000 °C
Iron atoms fuse to form heavier elementsCan light up our sky
Southern Crab Nebula
Supernova remnant – Veil Nebula – NGC6992
Neutron Stars Often less than 16 km in diameter Spin very rapidly
Energy is given off in narrow beamsPulsars – appear to give off pulses of energy
2 X-ray pulsars, Geminga and Crab Pulsar
Black Holes Incredibly massive starsGravity becomes so strong that even light cannot escape
Artist concept of a black hole
Black hole candidate in M87
Black hole in NGC4261
What is the fate of the sun and other stars??
Life cycle of stars Nebulae to supernova.
Notes 30.2 Stellar Evolution
A journey to the stars.
Stars The life and death of stars in our universe.
Lives of Stars.
Life Cycle of a Star.
Stellar Evolution Describe how a protostar becomes a star.
Life Cycle of Stars 1st Step: Stars form from nebulas
Life Cycle of Stars. Omega / Swan Nebula (M17) Stars are born from great clouds of gas and dust called Stars are born from great clouds of gas and dust.
Star Life Cycle.
Chapter 30 Stars and Galaxies.
Life Cycle of Stars.
The Life Cycle of a Star.
Objectives Determine the effect of mass on a star’s evolution.
Classifying Stars Brightness. Some stars are so bright that you can see them even in a lighted city, while others are so dim that you can only see them.
Stellar Evolution. Basic Structure of Stars Mass and composition of stars determine nearly all of the other properties of stars Mass and composition of.
The Evolution of Stars - stars evolve in stages over billions of years 1.Nebula -interstellar clouds of gas and dust undergo gravitational collapse and.
LIFE AND DEATH OF STARS. NEBULA Cloud of swirling gas and dust where stars are born Gravity causes matter to condense Will turn into a ….
NOT THOSE TYPES OF STARS! LIFE CYCLE OF STARS WHAT IS A STAR? Star = ball of plasma undergoing nuclear fusion. Stars give off large amounts of energy.
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