[tigerlily]

I wonder how much bigger the Earth would have been if it hadn't been smashed by a planetesimal? (Assuming the theory is true).

[dpark]

Presumably Earth would be smaller without the impact. Mars-sized matter was added to the Earth as a result of the impact and all that was lost was the moon (and perhaps some smaller amount that escaped entirely).

[suzzer99]

Without tides we may not even exist in that scenario.