Video Transcript
Which of the following occurred
first? Is it (A) the formation of the
Milky Way, (B) the formation of the solar system, (C) the Big Bang, or (D) the
development of life on Earth?
According to the Big Bang model of
the universe, billions of years ago, the universe did not contain any stars or
planets, not even any atoms. The universe was at this time
smaller than a single atom. The Big Bang was the event that
started the universe expanding to become the size it is now. The expansion of the universe made
possible the formation of the atoms, stars, galaxies, and planets that now exist in
the universe. So the Big Bang must have occurred
before the formation of any objects seen in the universe today. The correct answer is option (C)
the Big Bang.
