Astronomers theorize that the universe was created 13.7 billion years ago in an enormous explosion called the Big Bang. Describe two pieces of scientific evidence that help support this theory.\

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).