I have read Mars size if my memory serves me correct. Irregardless, another just so story that borrows from the fact that the universe is in order. There's alot of stuff going on at the same time and it all fits. But you would say it's all just laws and forces. What dictates those laws all worked together?
The collision that produced the moon almost certainly wasn't head on and I'm pretty sure the theory doesn't involve the mars sized object sticking to earth.Ã‚Â While the impact would definitely have affected earth orbit there's no reason to suspect it would make orbit around the sun impossible.Ã‚Â Without a head on collision only a fraction of the objects energy would be transferred to the earth and a significant amount of the energy that did get transferred would have gone into altering the rotation of the earth rather than it's orbit.
I know enough to know that by Newton's third law, all the mass of the moon would have caused a great reaction even if came out perpendicular to the orbit.
That is exactly what I said about velocity. It could be both--in a decaying orbit both speed and direction are changing.
Because velocity is both direction and speed, you can change your velocity if only your speed changes, or if only your direction changes, or if both your speed and direction changes.Ã‚Â In other words it's possible to change velocity without getting any faster or slower.
Gravity is changing the direction of earth's inertia, it isn't diminishing the amount of inertia it has.Ã‚Â Remember that velocity is both speed and direction, and you can change velocity without changing speed.
Inertia wants to go straight. When anything pulls against inertia there is resistance--if not there would be no orbit.
Obviously, numbers, you have studied physics more than I. And I never claimed to have background in it. And I am certainly not going to argue against current theories not having the background.
So the earth here orbiting at 67,000 mph. I realize the theory of spinning gasses, condensing, and then asteroids building the earth. How did all these asteroids come together when the earth was small. Were they magnetic?
The inside of the earth is believed to be iron--so it wasn't iron gas--that could only happen inside a star--not spinning gas in space. So it was hypothetically built by asteroids. Many of them it seems would have defied Newton's Third Law when they stuck together. It seems there would have been alot of banging around, but not alot of building.