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Transcript of Stars
Mr. Sin says,
"positives are dim"
G R A V I TY
Collapse from gravity
FUSION - the process in which light nuclei combine at extremely high temperatures, forming heavier nuclei and releasing energy
cause and effect
IF critical temperature
F u s ion starts
Fusion releases energy causing outward pressure ...
...opposes force of collapse due to gravity
gravity = outward pressure = (equillibrium - same size)
gravity > outward pressure/fusion = (collapse)
outward pressure/fusion > gravity = (expansion)
Mass of Stars
Small - medium Stars
Burn fuel quickly
Burn fuel slowly
Become White Dwarfs
r of Stars
white dwarfs give off light
after collapse and slowly cool
and become more dim
super nova can be
very bright and provide
ingredients for new nebula
The balance or lack of balance
between outward pressure from
fusion and collapse due to gravity
determines what stage a star is in
and when it will transition to a
The outward pressure from fusion depends on how much fuel is available
G > F
F > G
F = G
color is based on temperature
Magnitude is based on size
Life Stages of a Star
ture of Stars
temperature is based on size
energy is spread out
star is cool
energy is concentrated
star is hot
size is based on fusion and
the balance of fusion and gravity
He C = very very hot in core
large outward push
H He = hot
C = no fusion
gravity > fusion
What can be learned about a star's lifecycle by examining its characteristics?
Why does a star's properties change?
How does a star change from one life stage to another?