The document discusses the origin of the universe according to the Big Bang Theory. It states that approximately 15 billion years ago, a huge mass exploded, sending pieces expanding in all directions to form galaxies, and the galaxies continue separating and the universe expanding. The theory developed from discoveries in 1923 when Edwin Hubble created the largest telescope at the time and found that the universe is expanding.

1. THE
UNIVERSE

2. WHAT’S THE ORIGIN
OF THE UNIVERSE?

3. THE BIG BANG
THEORY

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.