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LEARNING OUTCOME

Understand the structure of the Sun and Nuclear Fusion Reactions.

Theory on Sun Structure
Here is a set of facts about the structure of the Sun:
• The corona is the large area of light that surrounds the Sun. It can only be seen during a solar eclipse.
Sunspots are the dark spots on the surface of the Sun. They are areas of strong magnetic fields.
A prominence is a large outburst of material from the surface of the Sun that is erupting into space.
The photosphere is the outer surface of the Sun.
• The chromosphere is the layer just beneath the outermost surface of the Sun.
• The convection zone is the region where heat is being transferred from the core to the surface and back again.
• The radiation zone transfers heat away from the core of the Sun.
• The core is where the nuclear fusion reactions are occurring and generating the energy that powers the Sun.

For homework carry out some research to find out more about the parts of the Sun that are listed above.
Record your findings on your own paper and report these findings back to the class. Include any diagrams where possible.

Sun: Statistics
Diameter: 1,400,000km
Composition: Hydrogen 75%, Helium 20%
Internal Temperature: 14 Million °C
External Temperature: 6,000°C
Mass: Approximately 2,000 billion tonnes of gas.

LEARNING OUTCOME

Be able to classify and characterise different types of stars using the Hertzspring-Russell Diagram. 

Stars are classified according to the Hertzspring-Russell Diagram. This is based on colour and
magnitude. The magnitude is the brightness of the star and a bright star has a small magnitude.

 

 The Hertzspring-Russell Diagram shows a pattern in the structure of the stars and indicates how a star ages with time. Stars spend most of their time on the main sequence. The star’s position on the main sequence also depends on the mass of the star.

The Hertzspring-Russell diagram depicts the life cycle of a star from when it is born to when it dies.

After a star runs out of nuclear fuel and and dies it becomes, for n  a neutron star or even a black hole.