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Galaxies - Coggle Diagram
Galaxies
Types
based on shapes
spiral galaxies
discs
made up of middle-aged stars
a moderate amount of gas and dust
the Milky Way
elliptical galaxies
round to flattened shapes
made up of old stars
not much gas or dust
irregular galaxies
undefined shapes
made up of young stars
lots of gas and dust
gravity
important role
keep galaxies together
make galaxies crash each other
Black holes and gravity
black holes
extremely dense
huge gravitational force
happen
a star collapses
lots of matter and energy
collect in one spot
Big Bang
massive explosion
Definition
stars
gather together
dust
gas
other things in clusters
can contain
10 million to 1 trillion stars
total mass
less than 10 percent
the rest
unknown substance
dark matter
Doppler shift
a galaxy's movement
wavelength of light
blueshift
objects moving toward Earth
get shorter
redshift
objects moving away from Earth
get longer