** The changes in galaxies as we look further away (and thus back in time), with distant galaxies more primitive and having fewer heavy elements.
— This shows some of the changes in the universe since the Big Bang, and confirms the deep time of the universe.
** The change in the apparent speed of type 1a supernova as we look back in time, with distant supernova exploding more slowly.
— This shows that the light has been stretched out by the expansion of space over billions of years.
There are many well-respected physicists, such as Stephen Hawking, Lawrence Krauss, Sean M. Carroll, Victor Stenger, Michio Kaku, Alan Guth, Robert A.J. Matthews, and Nobel laureate Frank Wilczek, who have created scientific models where the Big Bang and thus the entire universe could arise from nothing but a quantum vacuum fluctuation -- via natural processes.
I know that this doesn't make sense in our Newtonian experience, but it does in the realm of quantum mechanics and relativity. As Nobel laureate physicist Richard Feynman wrote, "The theory of quantum electrodynamics describes nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept nature as she is — absurd."
"To surrender to ignorance and call it God has always been premature, and it remains premature today."
— Isaac Asimov
For more, watch the video at the 1st link - "A Universe From Nothing" by Lawrence Krauss
-