Answer ! 2/ immediately after the big bang, the universe began to? a/ cool down b/ heat up c/shrink d/ condense 3/ a is a system of billions of stars and all of the planets that orbit around them? a/ solar system b/ universe c/ galaxy d/ planet 5/ light energy moves in? a/ waves b/particles c/ condensation d/ plasma 6/ all of matter and energy in the universe was once contained in? a/ a star b/ a galaxy c/ an element d/ a singularity