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Galaxies :star: - Coggle Diagram
Galaxies :star:
Different shapes
Irregular
undefined shape
young stars
lots of dust & gas
Spiral
discs
middle aged stars
moderate amt of dust & gas
ex) Milky Way
Elliptical
round & flattened sphere
old stars
not much dust & gas
gravity
keep together
make them crash
What
have
dust
other things in clusters
gas
total mass
10%
stars, dust, gas
90%
dark matter
Roles of Black Holes & Gravity
Black Holes
gravitational pull
happen
stars collapse
matter & energy collected
extremely dense
Big Bang
massive explosion
push everything away
Moving
Doppler Shift
blueshift
moving closer
wv getting shorter
redshift
moving away
wv getting longer