[Tycho?]

I'm not sure what you're looking for here. Moving things have momentum, because it takes a force applied to them to change their velocity.

http://en.wikipedia.org/wiki/Spacetime Or look it up somewhere else. Eintein played an important role since its through relativity that we have spacetime, not sure if he coined the term though.

Yeah, that doesn't really have anything to do with the actual meaning of center of gravity though.

You would measure it as a greater distance as far as I know. The universe is quite spread out now, so its obvious that it can appear to increase. Otherwise if we looked up the sky it would still look like what it looked like right after the big bang. But things move apart with time, making things a great deal furthar appart now.

The force would indeed be the same to push and object in a car and out of a car. When you are moving at a constant velocity it means there are no net forces acting on the system. When this happens there is no way to distinguish the moving frame from the still frame (from a physics point of view). Maybe its not the car thats moving at all, maybe its the earth rotating under the wheels of the car. From this point of view the question no longer makes sense. Eh, that explanation wasn't very good. Stick around for some other, better explanations. Oh, and there would be zero work done in any case, if you move an object horizontally there isn't work done, the force is perpendicular to the motion (force downward of gravity, motion forward of hand).

What? Ok, is it just me, or are sunspots posts totally incoherent?

The two particles would move together at an incredibly tiny rate. Electromagnitism and gravity both work over arbitrarly large distances. I'm not sure about the nuclear forces. I dont see why they would be different, but I've read they do drop to zero, so I'm not sure.

Well background microwave radiation has no effect on anything on Earth. And yes it is a coincidence, a pretty unremarkable one.

The Sun constitues over 99% of the mass of the entire solar system. Mercury is the only planet with no moons. While Mercury is the closest planet to the sun, Venus has the highest average temperature due to its runaway greenhouse effect. The tallest (known) mountain in the Solar System is Mons Olympus on Mars. The diameter of Jupiter is equivilant to the diameter of 11 Earths stacked on eachother. Saturn's moon titan has an atmosphere far thicker than Earth's and is composed mostly of nitrogen and methane The rotational axis of Uranus is tilted almost 90 degrees; its south pole points towards the sun. Neptune's moon Triton is the coldest body yet obvserved in the solar system. Pluto has a moon, Charon, which is more than half the diameter of Pluto itself.

http://www.google.com

I doubt it, particularly since electron orbitals arn't exactly logical to begin with, I highly douby applying such basic reasoning to such complicated physics will yeild a result that makes sense. You'll definately need some sort of source to back this up.

A line, with zero width.

Not much is known about the big bang itself. It is not proper to say that the big bang created space and time and matter, just that it was the start of the universe as we know it. Where did that energy come from? We dont know. Was there time or space or something else before the big bang? We dont know. What actually caused the big bang. Yeah, we dont know.

You should ask this in the engineering forum.

The book is wrong. Helium has two protons. Look it up on any site on the net if you feel the need to.

http://en.wikipedia.org/wiki/Photon#Photons_in_matter I'm sure if you use the search function you will get some of the time this has been discussed before.