This 21 billion years timeline of our universe shows the best scientific estimates of the occurrence of events since its beginning, up until uncontroversially anticipated events in the future. Zero of the scale is the present day. A large step on the scale is one billion years, a small step one hundred million years. The past time have a minus sign, e.g. formation of the sun happenend five billion years ago and this is marked at -5e+09 years. The theoretical "Big Bang" event happened approximate 13.7 billion years ago with an error of 0.2 billion years (Bennett et al.; 2003, ApJS, 148, 1), see age of the Universe.
Origin of our universe, Big Bang theory
Reionization, first stars began to shine
Formation of the first galaxies
earliest Population I stars
Formation of the Sun
Formation of the Earth
Emergence of life on Earth
Evolution of multicellular life
Evolution of mammals
This present day
Sun becomes too hot for life on Earth's surface
Collision of Milky Way and Andromeda galaxies
Sun becomes a red giant
Sun becomes a white dwarf and shines very weakly
The Primordial Era
Life on Earth
Shielded ~Life on Earth?
Years from now
The Stelliferous Era
See also
Timeline of the Big Bang
Graphical timeline of the Big Bang
Graphical timeline of the Stelliferous Era. This timeline uses the logarithmic scale for comparison of this article.
