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Stellar Evolution

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by

Katelynn Dorn

on 9 April 2015

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Transcript of Stellar Evolution

27.2 Stellar Evolution

Stellar Evolution
nebula- cloud of gas and dust
protostar- shrinking, spinning region flattens and compresses and increases in pressure
gas heats up so much that the protostar becomes plasma
once it reaches 10,000,000 C nuclear fusion begins, and a star is born
Giants and Supergiants
third stage- all H atoms have turned into He, C starts forming
star has enough energy to overcome gravity and expand
gases of outer shell grow cooler as they move from the core
giants- 10x bigger than sun, supergiants- 100x bigger than sun
White Dwarf Stars
final stage, gravity causes matter and star to collapse inward
planetary nebula- revealed core of illuminated gases
white dwarf- dense core of matter that slowly cools
Black Dwarf
no longer emits energy
dead star
Supernovas
supergiants create explosions 100x brighter than novas
energy causes fusion to occur and make elements as large as Fe and Mg
neutron star- dense ball of neutrons
pulsars- stars that emit radiation beams
black holes-intense gravity and contraction crushes its core
Hubble Telescope
photographed newborn stars, including the Eagle Nebula, which is 7000 light years away
photoevaporation- high energy photons from hot nearby stars bombard nebula
EGGs- evaporating gas globules
can encourage or stunt star growth
Main-Sequence Stars
second and longest stage in star life
fusion of hydrogen to helium
star does not expand due to gravity
Novas
white dwarf that experiences an explosion
when it nears a giant, the gases build up and cause high pressure
1 million times brighter than sun, fades quickly
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