Life Cycle of a Massive Star

Slayt: 1
STELLAR NEBULA
A nebula is a cloud of dust and gas that collapses under its own weight. As the cloud collapses, it gets warmer. When it reaches a certain temperature, nuclear fusion starts.
Slayt: 2
MASSIVE MAIN SEQUENCE STAR
At this stage, the pressure from the nuclear fusion reactions are balanced by the force of gravity. The star will spend millions or billions of years in this stage, depending on its size.
Slayt: 3
RED SUPER GIANT
When the nuclear fuel runs out, the star swells in size. As the star grows, the outer layers cool, giving the star a red color.
Slayt: 4
SUPERNOVA
The star’s core collapses, causing a violent explosion, and throwing the outer layers of the star into space.
Slayt: 5
NEUTRON STAR
What is left after the explosion is a very dense core known as a neutron star.
Slayt: 6
BLACK HOLE
OR
If the star is extremely big, a very dense neutron star, known as a black hole, could form. A black hole is an area of space where the gravity is so strong that even light can’t escape.

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