Using the information you have learned about massive stars, place the strips in the order which they occur in a star's life cycle. A supernova occurs. Nuclear fusion occurs which causes the star to glow. If it is a massive star, a neutron star forms. If it is a super massive star, a black hole forms.
Gravity pulls hydrogen gas together to form a cloud.
Iron, which acts as an energy sponge, forms within the star. A red giant forms when the star's hydrogen level drops. A main sequence star, which can live for millions or even billions of years, forms. Download a pdf version. Show me a printable version of this page.