This book reveals the origin of matter in our Universe, and aswers questions why models of the Universe proposed by Albert Einstein and Georges Lemaitre are wrong. Theses presented in this book consists of three topics. One of them concerns Lemaitre's model of the Universe origin, the Big Bang theory. The second zeroes in on Albert Einstein's as the principal author of the existing model of the Universe. The third reveals new model of the Universe, based on photons possessing mass. Standard model of the Universe is confronted with the new model. Inner contradictions present in Einstein's and Lemaitre's theorem are revealed, discussed and confronted with my model. The standard model must be rejected, I explained in this book why. (Mieczyslaw Jerzy Herba)