What was the name of the theory that competed with the big bang.

Hubble discovered the cosmic background radiation.

Hubble observed that galaxies are

Who explained the formation of elements (nucleosynthesis)

Found Cosmic Background Radiation (didn't know what it was)

Actually understood and explained Cosmic Background Radiation (didn't get any of the credit)

Predicted Cosmic Background Radiation but never found it.

This scientist proposed Inflation Theory which supported the idea of rapid inflation and then cooling of the universe.