It must have been a large object that hit the planet. What size would it be, approximately?
Wouldn't it be awesome if it was a giant alien space craft or something? :O
Hard to tell. It looks somewhat smaller than Shoemaker-Levy 9 considering I haven't seen any stories on the scars left. If there are no scars, the clouds have already enveloped the holes left in the atmosphere, meaning it was probably smaller than anticipated.
I wish I could find more links to this event. The impact seems to have been on the forward terminus and therefore a grazing event. It is unknown what object this was or its size, so I am curious if tidal breakup occurred and some debris slingshot-ed a 180 back at us.