As stars get older they go through changes. A star
begins "old age" when its central core of hydrogen has become
all helium. Its source of energy is gone. The outer layers of
the star begin to expand and cool down. It is a dull red in
color. It is known as a red giant.
The outer layer forms a ring nebula. (Remember a
nebula is a swirling cloud of dust and gas.) This nebula disappears
into space leaving behind the core. The core becomes hotter and
hotter as it collapses and forms a small, white star. This is called
a white dwarf.
The white dwarf has no energy left at this time.
Because of this it grows dimmer and dimmer until it is a cold, black
sphere called a black dwarf.
People grow older over a period of months and
years. You can't see the changes in stars because star changes occur
over millions and sometimes billions of years.
Directions: Answer the questions about how a star
A star begins "old age" when its central core of
becomes all helium.
When the outer layers of the star begin to expand and
cool and it is red in color, it is known as a red .
is a swirling cloud of dust and gas.
The collapsed core forms a small, white star. This
is called a white .
With no energy the left a star grows dimmer and dimmer
until it is a cold, black sphere called a black .
Star changes occur over
Star death occurs in stages. Put the following in
order. Use the numbers 1, 2, and 3.
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