Transcript star life cycle

Quiz on star life cycle
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1. Name the process which
generates energy in a star
Nuclear fusion : light atoms joining
together to make heavier atoms
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2. Which two elements are
involved in nuclear fusion in
a star?
Hydrogen and helium
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3. What force prevents a star
blowing apart for most of its
life?
Gravity – this is an attracting force
acting on all the material of the star
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4. In simple terms, why must
a star eventually "die "?
It will use up most of its hydrogen (this
makes it lighter so there is not enough
gravity to keep the gases together)
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5. A dying star starts to swell
up. What is the name given
to a swollen star?
A red giant
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6. Some stars collapse again
and then explode. What is
the name given to an
exploding star?
A supernova
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7. What is left after a red
giant has expanded and
cooled completely?
A white dwarf
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8. What is left at the centre
of a supernova explosion?
A neutron star – or possibly a black hole
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9. What is left around the
site of a supernova
explosion?
A nebula
( a "cloud" of gases)
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10. What might happen next
to the gases making up a
nebula?
They can be drawn in by gravity
and start a new star
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11. Where did all the
elements which make up
the people on Earth come
from ?
Elements are only made by a series
of nuclear fusion events in a star,
they spread across the Universe
after supernova explosions . So all
the atoms in you have been
through a supernova explosion!
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12. Will our Sun become a
red giant or a supernova?
A red giant : only a very large star
can turn into a supernova, the Sun
is a medium-sized star
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