Basic timeline of the Big Bang theory

This post is a basic timeline of the Big Bang theory. There are 9 events listed below chronologically. Source: Wikipedia

• 1225: Robert Grosseteste proposes that the birth of the universe was an explosion
• 1922: Alexander Friedmann proposes the Friedmann equations
• 1924: Georges Lemaître proposes expanding model of the universe
• 1929: Edwin Hubble observes that the universe is expanding
• 1931: Georges Lemaître proposes 'primeval atom' of the universe
• 1949: Fred Hoyle coins the term 'Big Bang'
• 1964: Arno Penzias and Robert Woodrow Wilson discover the cosmic microwave background
• 1990: COBE satellite observations support the Big Bang theory
• 2001-2010: WMAP spacecraft photographs the cosmic microwave background