As a continuation of yesterday’s discussion, I created a simple graphic to illustrate the relative timescales of significant (to us) events in our cosmic history. The two inner squares show the Cretaceous-Tertiary Extinction (65.5 Ma) and Emergence of Homo (2.5 Ma) (Ga = gigaannum = 1 billion years; Ma = megaannum = 1 million years). Any events more recent would be smaller than a pixel.

 

I wonder how many galactic empires rose and fell in the blue area, before our own place in the galaxy even began to take shape.