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Title: GCSE Physics 2.5 - Stars and Planets
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A*.) This is one of nine topics in the unit.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A*.) This is one of nine topics in the unit.
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2
...
1 AU = 1
...
47 × 1015 m
speed of light = 3 × 107 m/s
The stability of stars
•
depends upon a balance between gravitational force and a combination of gas and
radiation pressure
Fusion
•
1
...
3
...
Stars generate their energy by the fusion of increasingly heavier elements
...
In main sequence, the forces acting on a star are balanced (gravitational inward
forces match outward gas and radiation pressure forces)
...
The star will begin to swell as the combination of gas and radiation pressure exceeds
the gravitational force and the forces become unbalanced
...
The origin of the solar system
•
•
•
from the collapse of a cloud of gas and dust
Gravitational forces cause the matter to get closer together creating the Sun and the
planets
...
7
The Hertzsprug-Russell (H-R) diagram
•
A means of displaying the properties of stars, depicting the evolutionary path of a
star
Title: GCSE Physics 2.5 - Stars and Planets
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A*.) This is one of nine topics in the unit.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A*.) This is one of nine topics in the unit.