It's not "just a sketch on a stone" - I think you didn't read the whole theory? 1. They found a specific nebula in the position of the stars depicted by the co

It's not "just a sketch on a stone" - I think you didn't read the whole theory? 1. They found a specific nebula in the position of the stars depicted by the constellations on the stone. 2. The supernova that created the nebula would have been daytime-visible (and brighter than the moon at night). 3. The time that the supernova happened lines up with about the time that the stone etching was been made.