4. A huge (very big)
mass exploded and
all the pieces
separated
expanding in all
directions, forming
galaxies.
It happened 15
billion years ago
and the galaxies are
still separating and
the Universe
growing.
5. In 1923, Edwin Hubble created the biggest telescope in
the world. Then, they discovered that the Universe is
expanding and “The Big Bang Theory” was developed.
6. In 1923, Edwin Hubble created the biggest telescope in
the world. Then, they discovered that the Universe is
expanding and “The Big Bang Theory” was developed.
