The Weight of the Universe is Balanced on a Knife Edge

In the 1960s, cosmologists noticed a mysterious fact: if the universe were slightly denser, it would have collapsed billions of years ago. But had it been slightly lighter, it would have expanded too rapidly for any galaxies or stars to form. We owe our lives to this remarkable coincidence. This video is a clip from AlwaysAsking.com Episode7: "Was the universe made for life?" Full article: https://alwaysasking.com/was-the-universe-made-for-life/