NowThatWeKnow

"If it is possible" may be the key. I say no mashed potato galaxies.

Or maybe there aren't an "infinite number of universes". Merged post follows: Consecutive posts mergedI really do not see why every scenario would have to happen even if there were infinite universes. just like you would never run out of numbers when counting, they could all be different.

You have to keep in mind that it is not only the space twin's clock that is running slow relative to the Earth twin's clock. The space twin would not have time for as many "events" as the Earth twin. It may take a week (of Earth time) just to brush your teeth at relativistic speeds but would seem like normal time to you. Relative to the space twin, the Earth twin would be like a movie on fast forward.

My cousin has a 10" and I was impressed with what I could see. He indicated that would be a maximum size for most home astronomers. You really need to be away from city lights for best results. Setting one up each time you use it does require some work because of alignment and tracking motors.

It would seem to me that if the planets orbital plane of another star is not aligned with us, we would not find anything.

No, All batteries are DC.

There is no way to test your theory so I will go to bed now.

Wouldn't that be like saying your sight would quit working just because it was dark and there was nothing to see?

If you freeze time, movement will stop. If you stop movement, time will not freeze. I think time is independent of movement unless you can prove otherwise.

Not only movement, but gravity has an influence on time. Is time needed for gravity to exist?

Either time allows movement or movement creates time.

Time does not force movement but it does allow movement.

Even if the universe started at one point in time, the age of the universe would vary depending on what clock you were using.

They are linked by man to make math easier.

I see the speed of light as constant relative to its current location measured using time from its current location.

If you had several clocks running at different speeds you could compare the "nows" but they would all be different nevertheless. Just like if you had several cars moving at different speeds on the road. They would all be someplace at a particular time but not at the same place. Just trying to think of different ways to look at "now". [math]Now = t_{ship} = T_{Earth}[/math]

The expansion of space can cause two galaxies to separate from each other faster then the speed of light. However, the common belief is that any thing with mass is restricted to less then light speed because of what insane_alien said.

Thanks for the reply. I can see where it could be a problem sometimes. Maybe extended editing should allow adding text only and in a different color.

I was afraid there was going to be a problem and that is why I added "Corrections or additions welcome." I am slow to learn sometimes. Moderator - Is there a reason why I can only edit a post for a short period of time after posting before the "edit button" disappears?

The GPS satellite clocks have to be adjusted for speed and gravity and that is a matter of fact that is not open for debate.

The "red shift" (or blue shift) comes from the Doppler effect created by an object moving towards us or away from us. The Doppler concept is also used in police radar and has been proven very accurate. Supernovae are also used to determine the expansion of space. The initial bright phase of a supernova exploding close by may last two weeks. We may see a distant supernova that has an initial bright phase of three weeks because of the expansion of space while the light traveled towards us. Either one will show that space is expanding. Corrections or additions welcome.

Each of them would age according to their own clocks and "nows" but NOT according to the other twins clocks or "nows". I have to admit you are persistent.

But as Martin pointed out. "The issue of time in physics has not been settled and the prevailing concepts of time are constantly being challenged." More then one view can fit "science" so should we keep an open mind?

Did you read the second link Martin posted? Much of it was above me but it seems to resemble your thinking of "now". It starts off with "THE NEED TO FORGET TIME and TIME AS THE INDEPENDENT PARAMETER FOR THE EVOLUTION" and then goes on to say "what we call “time” is the thermal time of the statistical state in which the world happens to be,...". Most people here go with the current theory that fits with SR and GR but we must remember it is just a THEORY. The way things really work may surprise us all. Merged post follows: Consecutive posts merged Agree, agree, agree. I am thinking along these lines when I post but always seem to leave a "fly in the ointment". I know it is hard for some of you all to think outside of your mathematical box.

z=7.6 puts the galaxy 3.4208 billion light years away when it omitted the light we see today. Martin, much of what I know about cosmology has come from reading your post. It will be awhile before I can fill in for you so don't leave me hanging too long. I probably know about [math]7.6^{-10}[/math] as much as you.