A star is Question 2 Select one: a. A large mass of gas consisting mostly of hydrogen and helium. b. A large to small mass of gaseous methane that burns at incredibly high temperatures giving off radiation and electromagnetic spectrum waves. c. A large mass of interstellar dust that has to condense to form large quantities of is highly radioactive uranium producing nuclear explosion of extreme heat. d. A large dense mass of atoms whose gravity is so great that it produces enormous heat energy that is given off as the electromagnetic spectrum