Introduces Big Bang theory, nebula back phenomenon, Hubble’s law, multi-dimensional space, curved space and black hole in modern Cosmology and points out that these theories are all baseless and irrationality. Promotes the use of simple view of the universe – the materialist view of space?Ctime-mass-energy to study the universe. The observation and understanding of the universe are very limited now. Cosmology should be realistic, know as know, I do not know as I do not know.
Keywords: universe, big bang, nebula back, Hubble’s law, curved space, black hole