THE BIG BANG

THE BIG BANG that is the great explosion
WHAT IS IT
it is a theory about the birth of the Universe
WHEN
it happened about 14 billion years ago

1
at the beginning all matter was concentrated in a tiny, infinitely hot point
then, 14 billion years ago
a very big explosion
generated
a dense and luminous fog

2
the dense fog began to expand rapidly
and
THE STARS
were formed
because the dispersed matter particles came together

THE SOLAR SYSTEM
THE SUN
5 billion years ago
in an area of the Universe a cloud of gas and dust formed, rotating on itself
the center became increasingly hot and dense
the Sun was generated

THE EARTH AND THE PLANETS
clusters of dust and gas rotating around the Sun
fused together
forming the planets and the Earth