Orbits and Stars

What force acting towards the centre leads to satellites travelling in a circular orbit?

• Air Resistance

• Centrifugal force

• Gravity

• The Sun

What changes during the orbit?

• Speed

• Velocity

• Direction of motion

• Force

What happens to a satellite which is in orbit too close to a planet?

• It will stay at a constant height because gravity is still acting

• It will move away from the planet

• It will lose speed and crash

If a satellite is further from the planet, it will move slower to remain in orbit. True or false

• TRUE

• FALSE

Which is the word for a collection of dust and gas in space?

• Nudula

• Proto-star

• Nebula

• Main sequence star

What force pulls together dust and gas to form a protostar?

• gravity

• radiation pressure

• fusion

• centripetal force

Fusion of small elements leads to the formation of new elements in stars. True or false

• TRUE

• FALSE

All elements can be formed in a Main Sequence Star. True or false

• TRUE

• FALSE

Heavy elements can only be formed during a............

What is the fate of our Sun once it has no more hydrogen to fuse?

• Red-Giant, White Dwarf

• White Giant, Red Dwarf

• Red Giant, Supernova

• Red Giant, Black Hole