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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??
Notes 30.2 Stellar Evolution
A journey to the stars.
Stars The life and death of stars in our universe.
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.
Life Cycle of Stars.
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 ….
Life Cycle of Stars. Stars are born in Nebulae Vast clouds of gas and dust Composed mostly of hydrogen and helium Some cosmic event triggers the collapse.
Pg. 12. Mass governs a star’s properties Energy is generated by nuclear fusion Stars that aren’t on main sequence of H-R either have fusion from.
Life Cycle of a Star. Life Cycle of a Star like the Sun Mass is similar to the sun.
Astronomy – Stellar Evolution What is a Star? Stars are hot bodies of glowing gas that start their life in Nebulae.(1) 2.
Stellar Evolution. NGC 3603 Bok globules and giant gaseous pillars (evidence of embryonic stars), circumstellar disks around young stars progressing to.
The Life Cycles of Stars RVCC Planetarium - Last updated 7/23/03.
A cloud of gas and dust collapses due to gravity.
Life Cycle of a Star. Nebula(e) A Star Nursery! –Stars are born in nebulae. –Nebulae are huge clouds of dust and gas –Protostars (young stars) are formed.
Ch Stellar Evolution. Nebula—a cloud of dust and gas. 70% Hydrogen, 28% Helium, 2% heavier elements. Gravity pulls the nebula together; it spins.
Stars By: Mary Aragon Theory of Relativity. What are stars? Enormous balls of gas Made mostly of hydrogen and helium Constant nuclear process (fusion)
Life Cycle of Stars Nebula hundreds of light years in size contract under gravity
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