Each star is born and goes through a life cycle and eventually dies.

• True

• False

A nebula is

• a tiny cloud of gas and dust dispersed in a very big volume.​

• an inmense cloud of gas and dust dispersed in a very big volume.​

• an inmense cloud of gas and dust dispersed in a very small volume.​

All stars begins as nebulas​

• True

• False

A protostar is

• a dense cloud of gas and dust due to gravitational forces

• a star

• an expanding cloud of gas and dust with enough mass

A protostar is not a regular star yet because

• its hydrogen is not "burning". Therefore it is not really bright

• its hydrogen is "burning".

• none of the above

Big stars consume their fuel slower than small stars.

• True

• False

Big stars have longer lives than small stars​

• True

• False

When stars run out of hydrogen, its core begin to shrink.

• True

• False

When stars die, they can become

• white dwarfs or neutron stars

• white dwarf or black holes

• white dwarfs, neutron stars or black holes

What is a Binary System?

• A star systems that have two stars

• A star systems that have three stars

• A star systems that have one star