That’s true about Mel Gibson, and Russell Crowe for that matter. Weird, because I pretty much always like them in their film roles, *and* I like Australia. Ah well.
[’Civ pauses as he’s seized by an AC/DC “Rock and Roll Train” flashback]
[’Civ pauses as the previous flashback triggers a “Friday On My Mind” flashback]
Whew. Luckily, there wasn’t a Crowded House flashback.
The mass of the Earth has always been really, really huge by comparison with the impactors; in order to get a handle on how the Earth’s orbit might have changed (and it would have changed a smidgeon, probably) we’d have to have some idea of what the Earth’s orbit *was*, and that’s probably going to remain a matter of speculation until some clever person figures out time travel of some sort. ;’)
Now I'm agonna have to read up on perturbation theory.
But one would think any large impactor would have some effect on a planets orbit. Uranus got rolled by something. Maybe not an impactor. Prolly happened when "Venus" came cruising by on it's way to become Venus.