What is a nebula?
A cloud of dust and gas
A collection of billions of stars
An early Solar System, with a protostar, planets and moons
What causes dust and gas to pull together and form a protostar?
Electrostatic attraction
The Big Bang
Gravitational attraction
Which two things balance and keep a main sequence star in equilibrium?
Gravity and friction
Gravity and air resistance
Gravity and radiation pressure
What is a main sequence star?
Any star after the protostar stage
A stable stage in the life cycle of a star
Either a black hole or a neutron star
How old is the Sun?
4,600 years
4.6 billion years
13.8 billion years
What will the Sun become in the next stage of its life?
A red giant
A red supergiant
A black hole
Which type of star has supernova explosions?
Stars similar in size to our Sun
Stars much bigger than our Sun
All stars go through a supernova explosion
What happens when a white dwarf cools completely?
It stops emitting light and becomes a black dwarf
It stops emitting light and becomes a neutron star
It stops emitting light and becomes a black hole
Which of a possible two stars form after a supernova?
Neutron star or white dwarf
White dwarf or black dwarf
Neutron star or black hole
What determines whether a large mass star will end life as a neutron star or a black hole?
The star’s age
The star’s mass
The star’s position in its galaxy