Download Stars, Planets And Their Moons

Astronomy Research Project
Stars and How They Form
By: Chelsea Incognito
Different Types of Stars
•
•
•
•
•
Red Giants & Supergiants
White Dwarfs
Pulsar & Variable
Supernova
Neutron Stars and Black Holes
Red Giants and Super Giants
• First, this star starts off stable. Over a
long time, the star loses its stability due
to its nuclei using up all of the energy.
This causes the core to contract. The star
gets so hot that its outer layers to
expand. The expansion makes the star’s
surface larger. The star now appears
brighter. The stars surface expands and
forms a red giant star. If the star
expands more, it will form a supergiant
star.
White Dwarf Stars
• They form when a low or
medium mass star collapses.
• Then, the nuclei of the atoms in
the star are squeezed tightly
together. This produces the
White Dwarf star.
Pulsar & Variable Stars
Pulsars
• This star is thought to be created by a remaining
core of a Neutron Star that was left behind from
a star that formed into a Supernova star.
Variable Star
• A star that changes in brightness while it
expands and contracts is called a Cepheid
variable.
• These stars have a brightness variable. Unlike
other stars, these stars vary in brightness over a
certain period of time.
Neutron Stars And Black
Holes
Neutron star…
• Is the mass that is left over after a star
explodes
Black holes…
• Forms when a star collapses
• Definition: Massive object in space
whose gravitational force is so strong
that light rays can not escape
Supernova Star
• White dwarf stars form into Supernova stars
• First, when the fusion stops, it leaves an iron
core. This iron core collapses when the star
starts to cool. Then, the pressure and temp. rise
drastically when the collapse occurs
• Next, the iron nuclei combines with heavy
elements. This causes the star to collapse. The
star explodes so violently that half of the stars
mass is blown away. This creates a bright
star- the supernova.