Which physical properties do all stars have? Check all that apply.

They are made of gases.
They shine very brightly.
They have a spherical shape.
They contain iron in their cores.
They make energy through fusion. Which physical properties do all stars have? Check all that apply.

They are made of gases.
They shine very brightly.
They have a spherical shape.
They contain iron in their cores.
They make energy through fusion.