Cycle of the Life of a Star

Life Cycle of a Star Chart Storyboard

שקופית: 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.
שקופית: 2
MAIN SEQUENCE STAR
At this stage, the outward pressure caused by nuclear fusion is balanced by the force of gravity holding the star together. The energy created by the nuclear fusion is emitted as radiation.
שקופית: 3
RED GIANT
When the star has used up its nuclear fuel (hydrogen), the star grows in size and the outer layers cool, making the star red.
שקופית: 4
PLANETARY NEBULA
These are some of the most beautiful objects that can be observed in the night sky. A planetary nebula occurs when the outer layers of the star are lost when moving from a red giant to a white dwarf.
שקופית: 5
WHITE DWARF
A white dwarf is a hot, small, dense, dead star. This is the core of a star that remains after the outer layers have drifted off in the planetary nebula.
שקופית: 6
BLACK DWARF
After a long period of time, the hot, dense core known as a white dwarf cools and stops radiating light.

Planetary Nebula - NASA Goddard Photo and Video - (רישיון Attribution )
The Orion Nebula and cluster from the VLT Survey Telescope - European Southern Observatory - (רישיון Attribution )

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