This question is about astronomical bodies and stellar evolution.
Describe two differences between the orbit of a comet and the orbit of a planet around the Sun.
The diagram shows a cross-section of a stable main-sequence star.
Point QQQ is inside the star.
State the direction of the gravitational force FgF_gFg acting on point QQQ.
State the direction of the outward radiation pressure force FpF_pFp acting on point QQQ due to nuclear fusion in the core.
Explain why the size of the star does not change. Write about force FgF_gFg and force FpF_pFp in your answer.
Complete the sentences about the life cycle of a star much more massive than our Sun using the words below. Each word can be used once, more than once, or not at all.
- black hole
- neutron star
- protostar
- red supergiant
- supernova
- white dwarf
Towards the end of its life, a high-mass stable star will expand.
The star becomes a ............................................................. .
The star will then explode in a massive explosion called a ............................................................. .
After this, the remaining core of the star collapses to become either a ............................................................. or a ............................................................. .