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The life cycle of stars

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James Pepperell

on 1 August 2013

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Transcript of The life cycle of stars

The Life Cycle of Stars
90% of a star's life cycle
The star is STABLE during this period, as nuclear fusion balances gravity
Main sequence star
Fusion of other light elements starts, such as Helium
This happens at a much higher temperature and produces much more energy
Red Giant
White Dwarf
Star fuses other light elements into heavier ones, up toand including Iron, Fe
When fusion finishes the star collapses due to gravity

Red super giants
Massive explosion which can outshine an entire galaxy
Extremely dense remnants of a supernova, composed mainly of neutrons
Small and faint
Neutron star
An object so dense that, within a certain distance, even light cannot escape.
Black hole
White dwarf...
The core cools and is no longer luminous, becoming a black dwarf
When the critical temperature is reached...
nuclear fusion
Nuclear Fusion
Hydrogen atoms are fused together to make helium, releasing energy.
Eventually the star runs out of hydrogen...
What happens to
stars, such as our Sun?
Our Sun as a Red Giant
When fusion of Helium finishes...
the core collapses due to gravity...
As the core collapses, the outer shell is expelled...
and the solar wind blows away the hydrogen covering to form...
Gravity pulls gas and dust together...
towards the gravitational centre, which forms...
Whats happens to
stars, (stars with a mass 10 times that of our sun)?
Eventually the star runs out of hydrogen...
Spin very fast, emitting radiation
PULSARS - pulsating radio sources
For VERY high-mass stars
(stars with a mass more than 20 times that of the Sun)
Speed of light = 300 000 000 m/s
The shock wave of a supernova propels matter, known as the supernova remnants, into space...
A giant cloud of gas and dust from which a star is born.

A stars lifetime, the duration between its birth and its death, may be billions of years.
A series of events that are repeated in the same order.
Full transcript