Science 10 with CSS teacher

The Big Bang theory is based on the General Theory of Relativity, the theory developed in the 1900's by Albert Einstein. The major observations that support the Big Bang theory are the expansion of the Universe (first seen by Edwin Hubble in the 1920s), the abundance of the different chemical elements seen in the Universe and the detection of the CMBR (Cosmic Microwave Background Radiation). The name ‘Big Bang’ is a little misleading as it suggests that there was a huge explosion in space. Instead, it is better to think of the Big Bang as an expansion. The name ‘Big Bang’ was invented by astronomer Fred Hoyle who was trying to ridicule the theory, but it was so catchy that it stuck.