Show:
Stars
Forces
Our Solar System
100

How much bigger than the sun must a star be to become a black hole?

more than 5 times

100

Name the force that causes planets to orbit the sun

gravity

100

What is at the centre of the solar system?

The Sun

200

In which part of the life cycle will stars spend most of their time?

Main Sequence

200

Explain why gravity is a non-contact force. 

objects do not need to touch for the force to be felt. 

200

Name the galaxy that our solar system is part of. 

Milky Way

300

Describe what happens to a white dwarf over time. 

Emits energy to cool down and become a black dwarf

300

Name the force that balances gravity in main sequence stars

Fusion Pressure

300

Name the biggest planet in the solar system. 

Jupiter

400

Name the stage in the life cycle of a star that produces elements heavier than iron. 

Supernova

400
What force causes a nebula to turn into a protostar?

Gravity

400

The original model of the solar system had the earth at the centre. Why was a new model suggested?

the old one couldn't explain new observations
500

What is the difference between a red giant and a red supergiant?

Red supergiants are bigger and will fuse elements up to iron. Red giants will only fuse elements up to oxygen. 

500
Stars can't fuse elements heavier than iron. Describe what happens to the forces in a star when the core is made from iron. 

Fusion pressure is less than gravity, so the star collapses in on itself, releasing its GPE as heat in the form of supernova. 

500
List the planets in order from the sun.

Mercury, venus, earth, mars, jupiter, saturn, uranus and neptune