What property of a star does its colour tell us?

The colour of a star tells us about its surface temperature .

True or False? The hottest stars are red.

False. The hottest stars are blue , whereas the coolest stars are red .

Which has a hotter surface temperature, a red giant or a white dwarf?

A white dwarf has a hotter surface temperature than a red giant.

True or False? As a star expands, its surface cools and becomes redder.

True. As a star expands, its surface cools and becomes redder .

True or False? All stars form from a cloud of dust and gas which becomes a protostar and then a main sequence star.

True. All stars follow the same initial stages in their life cycle: Nebula (cloud of dust and gas) Protostar Main sequence star The stages that follow depend on the mass of the main sequence star that forms.

What forces, including their direction, act when a star is in a stable state?

The forces acting on a star in a stable state are: Inward gravitational force Outward pressure due to fusion reactions

Name the stages, in the correct order, in the life cycle of a star similar to the Sun.

The stages, in the correct order, in the life cycle of a star similar to the Sun are: Nebula (cloud of dust and gas) Protostar Main sequence star Red giant White dwarf

When does a protostar become a main sequence star?

A protostar becomes a main sequence star when nuclear fusion reactions are initiated in its core and the inward force of gravity is balanced by the outward pressure from the fusion reactions.

When does a main sequence star turn into a red giant?

A main sequence star turns into a red giant when hydrogen in the star's core begins to run out and the star begins to fuse helium into heavier elements.

True or False? A high-mass star will eventually explode as a supernova and become a white dwarf.

False. A high mass star will eventually explode as a supernova and become a neutron star or a black hole .

Name the stages, in the correct order, in the life cycle of a star with a mass larger than the Sun.

The stages, in the correct order, in the life cycle of a star with a mass larger than the Sun are: Nebula (cloud of dust and gas) Protostar Main sequence Red supergiant Supernova Black hole, or neutron star

What is a supernova ?

A supernova is a large exploding star .

Under what conditions does a supernova occur?

A supernova occurs when a star much more massive than the Sun reaches the end of its red supergiant stage. It collapses, becomes very unstable and explodes .

IGCSEScienceEdexcelScience (Double Award)PhysicsFlashcards8. AstrophysicsStellar Evolution

Stellar Evolution (Edexcel IGCSE Science (Double Award): Physics): Flashcards

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FrontClassification of Stars
What property of a star does its colour tell us?

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Cards in this collection (13)

What property of a star does its colour tell us?
The colour of a star tells us about its surface temperature.
True or False?
The hottest stars are red.
False.
The hottest stars are blue, whereas the coolest stars are red.
Which has a hotter surface temperature, a red giant or a white dwarf?
A white dwarf has a hotter surface temperature than a red giant.
True or False?
As a star expands, its surface cools and becomes redder.
True.
As a star expands, its surface cools and becomes redder.
True or False?
All stars form from a cloud of dust and gas which becomes a protostar and then a main sequence star.
True.
All stars follow the same initial stages in their life cycle:
1. Nebula (cloud of dust and gas)
2. Protostar
3. Main sequence star
The stages that follow depend on the mass of the main sequence star that forms.
What forces, including their direction, act when a star is in a stable state?
The forces acting on a star in a stable state are:
1. Inward gravitational force
2. Outward pressure due to fusion reactions
Name the stages, in the correct order, in the life cycle of a star similar to the Sun.
The stages, in the correct order, in the life cycle of a star similar to the Sun are:
1. Nebula (cloud of dust and gas)
2. Protostar
3. Main sequence star
4. Red giant
5. White dwarf
When does a protostar become a main sequence star?
A protostar becomes a main sequence star when nuclear fusion reactions are initiated in its core and the inward force of gravity is balanced by the outward pressure from the fusion reactions.
When does a main sequence star turn into a red giant?
A main sequence star turns into a red giant when hydrogen in the star's core begins to run out and the star begins to fuse helium into heavier elements.
True or False?
A high-mass star will eventually explode as a supernova and become a white dwarf.
False.
A high mass star will eventually explode as a supernova and become a neutron star or a black hole.
Name the stages, in the correct order, in the life cycle of a star with a mass larger than the Sun.
The stages, in the correct order, in the life cycle of a star with a mass larger than the Sun are:
1. Nebula (cloud of dust and gas)
2. Protostar
3. Main sequence
4. Red supergiant
5. Supernova
6. Black hole, or neutron star
What is a supernova?
A supernova is a large exploding star.
Under what conditions does a supernova occur?
A supernova occurs when a star much more massive than the Sun reaches the end of its red supergiant stage. It collapses, becomes very unstable and explodes.

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