Recent content by HZY

During the return trip from Galaxy B back to Galaxy C, a new technology was invented that allows the mother ship (Ship 1) traveling at speed of light c relative Galaxy B to send out its shuttle ship (Ship 2) that can travel away from the mother ship at also the speed of light c. And the shuttle...

There was simply no time. They are trying to stay Galaxy C visual, or at least get a final glimpse of it. Billions of light years of opportunity could potentially be lost while you take a show on planet Z, a decision probably not considered cosmologically wise.

Immediately upon arriving at Galaxy B, the ship quickly turns around and attempts a return trip back to Galaxy C. Could the ship make it back to Galaxy C in time to still be able to catch A if it were to continue flying pass Galaxy C? How long would each case take, first back to Galaxy C then...

Correction: Assume the rate of expansion of space between Galaxy A and C and between B and C is c at the beginning of this scenario.

Now, assume there exist three galaxies, Galaxy A, B, and C, such that the distance between Galaxy A and B is twice the Hubble radius, with Galaxy C located right at the midpoint between Galaxy A and B. If a spaceship takes off from Galaxy C and flies toward Galaxy B, which of the two galaxies...

If the distance separating galaxy A and B is such that the expansion rate of space between them is exactly equal to c, what is that distance in light-year? What is the resulting measured red shift? Would observers either galaxies be able to see each other? If an observer in galaxy A got on a...

If you get on a spaceship and fly towards Galaxy X, what happens then? Will you ever catch up to it? If you do, what will you see?

If we look up the sky at galaxy X whose light took Y amount of time to reach us from distance Z, where is the galaxy X now?

[/PLAIN] How about this:

You mean like this...

Isn't bringing the future time frame into the present time frame so you can just step into the future the idea of time travel? If two past light cones representing two versions of the observable universe could be brought toward each other, then their individual now's be made to overlap, creating...

Basically, what I am trying to find out is that is it possible for all times, be it past, present, or future, to co-exist concurrently in the same time frame relative to different arrival points of a particular light ray from a distant object, measured against the present time frame, within the...

The difference is that time travel allows the 24-hour future to concurrently exist at present. So based on the logic of past-light-cone, one could say that the reason we are living in the present and not the future is because the future light rays haven't gotten to us yet, today. But what if...

Is it possible to travel through space between two adjacent past light cones? And it is also possible to travel through time between your past light cones at different time?