PHYSICAL SCIENCE REVIEWER

all matter and

energy in the universe are

crammed into a tiny point of

pure energy. Where it came

from or why it happened are

unknown.

proposed the Big Bang Theory

on 1920.

Alexander Friedman and George

Lemaitre proposed the Big Bang Theory

on

According to the theory,

around 13.7 B years ago, there was

nothing and nowhere. Then suddenly,

due to the random fluctuation in an

empty void, THERE WAS A GREAT

EXPLOSION AND EXPANSION. The was called

ACCORDING TO THE BIGBANG TEHORY AROUND ___ YEARS AGO THERE WAS AN EXPLOSION AND EXPANSION

The universe expanded and getting

bigger from the size of an atom.

The universe continued to expand. It

became distinct, possessing gravity,

strong nuclear force, weak nuclear

force and electromagnetic force.

Fundamental particles combined

to form hydrogen nuclei.

Hydrogen nuclei began to combine in

pairs to form helium nuclei.

what are the basic

elements.