. One scientific theory of the origin of the universe is the much misunderstood big bang theory

A、.Physicistsnowbelievetheycanconstructwhathappenedintheuniverseduringthefirstthreeminutesofitsbeginning
B、Manyscientistsbelievethat,duringmicrowaveexperiments,wecanactually“hear”echoesofthebigbang.
C、Thepopularnotionisthatthebigbangwasahugeexplosioninspace,butthisisfartoosimpleadescription
D、.Thebigbangtheory,ifaccepted,convincesusthattheuniversewasnotalwaysasitisnow