Unit 8 - Astrophysics

What is a galaxy?

• A large collection of billions of stars

• A collection of planets orbiting a star

• A single star

• A small group of planets

What happens to a star when the hydrogen is used up?

• It becomes a nebula

• It becomes unstable and collapses

• It becomes a main sequence star

• It becomes a protostar

What is a nebula?

• A cloud of dust and gas

• A type of galaxy

• A small planet

• A black hole

What is the result of hydrogen nuclei fusing together?

• Formation of helium nuclei and release of energy

• Formation of carbon nuclei

• Formation of oxygen nuclei

• Formation of nitrogen nuclei

What is the term for a star that balances outwards and inwards pressure?

• Main sequence star

• Red giant

• White dwarf

• Black hole

What happens to a star similar in mass to the Sun when it expands?

• It becomes a red giant

• It becomes a black hole

• It becomes a neutron star

• It becomes a protostar

What is the final stage of a star similar in mass to the Sun?

• White dwarf

• Black hole

• Neutron star

• Protostar

What is the term for the initial stage of a star's life?

• Protostar

• Red giant

• White dwarf

• Black hole

What is the final stage of a star that becomes a red giant?

• White dwarf

• Black hole

• Neutron star

• Protostar

What is the shape of the orbits of comets around the Sun?

• Highly elliptical

• Perfectly circular

• Slightly elliptical

• Spiral