What are stars made of? a. gases, primarily hydrogen, then helium b. nothing but light and energy c. trick question- we really don't know d. pretty much the same as earth, but with a special shell e. they're fireflies stuck in the big blue/black thing 2. what provides the energy (and so light and heat) of a star? a. gravitational contraction b. lots of electricity c. atomic energy/nuclear reactions d. continual explosions e. chemical reactions at the surface?