Most scientists now believe that
the Universe was born from
a hot, dense spot more than
13 billion years ago. They call
this event the Big Bang.
The Big Bang
Do you think the Big Bang was an explosion?
292
The universe
A Universe is born
What was later
termed the Big
Bang was first
proposed by
Georges Lemaitre
in 1931. Scientists
believe it was
the beginning of
everything, but
don’t know what
caused it to happen.
What
happened?
Space and time
were brought to
life from a minute
speck, which was
unbelievably hot and
heavy. The energy
contained in this
speck immediately
began to spread out,
in the form of an
ever expanding
fireball.
As the Universe expands and cools,
at 300,000 years, matter as we
know it starts to form. The Universe
is a thousandth of its size today.
Georges
Lemaitre
T
h
e
B
i
g
B
a
n
g
:
“
a
d
a
y
w
i
t
h
o
u
t
y
e
s
t
e
r
d
a
y
”
.
