Download Life Cycle of STARS

BELLWORK
• Are stars BORN???
• Take a moment to think about
our own Sun, and write down
an idea about how it was
formed using what we have
learned so far.
Life Cycle of STARS
The Stellar Nursery
Birth of a Star
• Stars are born out of a ball of
gas, called a Nebula. This is the
stellar nursery.
• Gas and particles are pulled
together, their mass
condenses .
• The main ingredient is Hydrogen.
What Causes the Collapse?
• What did we say about all
matter before?
• All matter is attracted to
other matter = gravity.
Different Types of Stars
• Stars can become different
types after the nursery.
• Main-Sequence stars
• Giants
• Supergiants
• White Dwarf
Stars Get OLD
• Stars start out of the nursery.
• Gain material slowly.
• Stars lose material through
nuclear fusion, over billions
of years.
• Sometimes they lose material
REALLY FAST!
Example of Supernova
End stages of a Star
• After middle age, retirement.
• Our Sun will become a red
giant eventually, then a white
dwarf most likely.
• More massive stars explode
–Supernova!!!!!!!!!!!!!
Supernova
• The mass of a star collapses.
• It explodes violently as seen
in the animation.
• The result:
–Neutron Stars
–Pulsars
–Black Holes
Death of a Star
• Supernovas A supernova is a gigantic
explosion in which a massive star
collapses.
• Neutron Stars and Pulsars A star
that has collapsed under gravity to
the point at which all of its particles
are neutrons is called a neutron star.
If a neutron star is spinning, it is
called a pulsar.
• Black Holes A black hole is an object
that is so massive that even light
cannot escape its gravity.
Different Types of Stars
• Your book walks you through
the different types of stars.
• Pages 40-45
• Were going to create a
concept map of this process.
• What is a concept map?
Concept Map
Stellar
Nursery:
Nebula’s are
giant clouds
of gas