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Black
Holes
Black Holes
The intense
gravitational field left
when a giant star
collapses
It is called a black
hole because not
even light can
escape
Photon Sphere
The outer edge
where light bends
but is still escapable
Event Horizon
The point at which
no light can escape
Singularity
The shrunken star
too small to be
measured but with
indefinite density
Galaxies
Galaxy
A large assembly of
stars and nebulae
Group of Galaxies
The Milky Way
Our galaxy
Flat disk with spiral
arms
Three Types of
Galaxies
Elliptical
Oval shaped
Most common type
of galaxy found
Contains little gas
and dust
Most are dim and
difficult to see
Spiral
Dense center with
spiral arms
Bright and easy to
see
Contains large
amounts of gas and
dust – always
producing new stars
Irregular
No specific shape
Contains large
amounts of gas and
dust
Small and faint
therefore hard to see
Quasars
Quasars
Small, powerful
source of energy
thought to be cores
of distant spiral
galaxies
They emit radio
waves and bright
light
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