[Fred Nerks]

'They' certainly saw something, perhaps a super-nova, as this petroglyph indicates:

...but this is a symbol found all over the world.

[colorado tanker]

...but this is a symbol found all over the world.

How many prehistoric structures or engravings have we seen all over the world with astronomic implications? To say the Aborigines are the "first" is a stretch on this evidence.