Stars and Galaxies
The closest star to us
• The sun
A cluster of stars
• A galaxy is a cluster of stars together
The universe
• The universe is
everything in space
The different types of universes
Stars make up galaxies which make up the universe
The different types of galaxies
• Draw three boxes each with a title and a
picture of the galaxy in the box
Spiral Galaxy
Elliptical Galaxy
Irregular Galaxy
What makes one star different from
another?
1. Mass determines lifespan of star
2. Flame demonstration: predict on left side
order from coolest to hottest.
(orange, white, yellow, red, blue)
The color of a star tells its surface
temperature
• Remember: ROYWB
• A star’s color tells you how hot its surface is.
From coolest to hottest:
• Red, orange, yellow, white, blue
Size of stars
A star is born
Nebulas- dust and
debris collecting in
space
Protostar
• Star is being
formed from
nebula dust and
debris
Star is formed=main sequence
Dying star
Super nova
• Explosion
moving at
about 6
million mph!!
OR
White dwarf star  Black dwarf star
A star has died
• Neutron Star
• If the star is at least 1.5 but
less than 9 times larger than
the Sun, the core left after
the supernova will collapse
into a neutron star. This is a
star composed only of
neutrons.
• Black Hole
• If the star is at least 9 or
more times larger than the
Sun, the core will continue
to collapse into a black
hole, an extremely dense
area with a strong
gravitational pull that light
can not escape.
Neutron Star or Black Hole?
Types of Galaxies – Quasars…
• A quasar is a distant
galaxy with a black
hole at its center.
• As enormous amounts
of gas revolve around a
black hole, the gas
heats up and shines
brightly.
See board
• Diagram of Stars life
Life cycle of a star (no dwarfs here)