Originally Posted By: kallog
Couldn't they have slowly moved together over a long time, a bit like the moon is slowly moving away?

Preearth could calculate the angular momentum change. Preearth would have to have been spinning at the same speed as heaven orbited, so that the collision was localized in one spot. Knowing the original length-of-a-day would surely be able to be connected with some evidence.

I am surprised,... you got it.

Others (including a number of academics) have looked at this for ages and never figured "the obvious".

As Heaven slowly approaches PreEarth, tidal forces cause PreEarth to spin faster as Heaven orbits faster (i.e., Heaven is kept tidally locked, all the way in).

Tidal forces keep things synchronized, so that even though Heaven hits a "glancing blow" it is actually a "head on collision."

By the way, the reason I haven't told people about this (and a lot of other detail) is that there is organized theft of ideas among academics. And I didn't want to make things too easy for the thieves.

Earth formed from a collision
www.preearth.net

Plate-tectonics is wrong
www.preearth.net/plate.html