You are right. As mentioned in the article...
We can thank this for our 24 hour days because before this, Earth's days were only 6 hours in duration.Hartmann, along with Planetary Science Institute colleague Don Davis, determined that a roving planetoid, large enough to blast off enough mantle material to make the moon, could have struck the Earth shortly after its formation.
Christian that is kick ass gorgeous. What shutter speed
That particular shot was at:
f/11, 1/200th, iso 200 when I shot it. If I did it today I probably would bump the iso to 400 and then double the shutter speed to 1/400th.
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