Who made the Big BangTheory?

Answer 1

Jesuit priest Georges LeMaitre was, in 1927, the first to propose the idea that space is expanding. His work was purely mathematical, but he did predict what Edwin Hubble saw a couple years later -- that the distance between us and all distant galaxies is increasing, and the rate of increase depends on the distance to such galaxies. LeMaitre later refined his work in proposing that our Universe was once a "primeaval atom," ie, immensely more dense and hot than it is now.