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THE LIFE CYCLE OF STARS
Chapter
15-2
Part 3
The Aging of Massive Stars
• Massive stars use their hydrogen
much faster than stars like the sun
do.
• Since these stars generate more
energy, they are very hot, but also
have shorter lives.
• They also have very dramatic ends!
Supernovas
• A supernova is a gigantic explosion in
which a massive star collapses and its
outer layers are blasted into space.
Even larger
stars can
become neutron
stars, pulsars,
and black holes.
Neutron Stars
• Following a supernova, the
center becomes a very dense
and small sphere of neutrons.
• This is called a neutron star.
• A single teaspoon of this weighs
100 million metric tons on
Earth.
• A neutron star 20x smaller
than our sun would emit the
same energy as 100,000 suns.
Pulsars
• A pulsar is a
swiftly rotating
neutron star.
• It can only be
detected on Earth
when their beams
of radiation sweep
past the Earth.
Black Holes
• Sometimes leftovers
of supernovas are so
massive that they
collapse to form a
black hole.
• A black hole is so
small and massive, and
its gravity is so
strong that not even
light can escape its
pull.
THE END