If space as scientist reckon is a void and nothing slows down but in the same breath say the Universe is full?

Question

of gas and dust.
Would this not cause friction on a moving object and slow it down?

Answer 1

They don't say that.They say the rate of expansion of the universe itself is not slowing down,in fact it is increasing.That is quite different than saying "nothing slows"Of course it does."Any object in motion will remain in motion unless acted on by an outside force"If a dust particle hits Jupiter,the effect may be so extremely small as to be unnoticeable,but there IS an effect.Comet shoemaker-Levy 9 sure slowed down a lot when it hit Jupiter,and caused Jupiter's' rotation to change(in a very,very,slight manner,Jupiter is HUGE).The expansion is space itself expanding,and that has nothing to do with the dust and particles

Answer 2

It is all about probability.
Space isn't REALLY a void, it has a few bits and pieces of matter floating about here and there, but it is so sparsely dispersed that is might as well be a void.
As with the friction, the particles that are in the void are usually dust and gas, which isn't too hard to move out of the way, so the energy lost moving it is negligible.

Answer 3

You are still talking very dilute volumes. Instead of 1 atom (probably of hydrogen) every cubic metre, a cloud may be 20 atom /m^3. It is much denser than empty space, but still a vacuum for all practical purposes.

Answer 4

The vacuum is better than the vacuum in the radio tubes that we can make here on earth. The real clue is in the light from a distant star is clear even though it has traveled 1000 light years.

Answer 5

objects in space occasionally change course after hitting debris,im sure this does alter the velocity also in some cases.

Answer 6

Yes, but it would do it so slowly that it can be discounted, because it's very sparse.