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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 . ImageSize = width:600 height:2000 PlotArea = left:60 right:60 bottom:45 top:45 AlignBars = early Colors = id:period1 value:rgb(1,1,0.7) # light yellow id:period2 value:rgb(0.7,0.7,1) # light blue id:events value:rgb(1,0.7,1) # light purple Period = from:-13700000000 till:7000000000 TimeAxis = orientation:vertical ScaleMajor = unit:year increment:1000000000 start:-13000000000 ScaleMinor = unit:year increment:100000000 start:-13700000000 BarData = # bar:Periods bar:Bar1 bar:Dummy1 bar:Dummy2 bar:Dummy3 bar:Dummy4 bar:Dummy5 bar:Bar2 PlotData= width:60 mark:(line,teal) textcolor:black fontsize:M bar:Bar1 color:events align:left shift:(40,0) at:-13700000000 shift:(40,4) text:" Origin Of Our Universe, Big Bang Theory " from:-13600000000 till:-13300000000 mark:(line,white) text:" Reionization , first stars began to shine" at:-13100000000 text:" Formation Of The First Galaxies " at:-10000000000 text:" Earliest Population I Stars " at:-5000000000 text:" Formation Of The Sun " at:-4500000000 text:" Formation Of The Earth " at:-3500000000 text:" Emergence Of Life on Earth" from:-600000000 till:-500000000 mark:(line,white) text:" Evolution Of Multicellular Life " at:-220000000 text:" Evolution Of Mammals " at:0 mark:(line,red) text:" This Present Day " at:1000000000 text:"Sun becomes too hot for life on earths surface" at:3000000000 text:"Collision of Milky Way and Andromeda galaxies" at:5000000000 text:" Sun Becomes A Red Giant " at:7000000000 text:" Sun Becomes A White Dwarf and shines very weakly" bar:Bar2 color:yellow align:center shift:(0,0) from:-13700000000 till:-13600000000 mark:(line,white) text:" The Primordial Era " from:-3500000000 till:1000000000 mark:(line,white) text:"Life on earth" from:1000000000 till:2000000000 color:green mark:(line,white) text:"Shielded ~Life on earth?" TextData = fontsize:M # tabs:(210-left) pos:(10,1990) text:"Years from now" pos:(445,250) text:" The Stelliferous Era " SEE ALSO
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