If it is physically possible to exceed the velocity in which the universe is expanding, can we move forward in time?
2007-04-14 21:55:11 · 7 answers · asked by Armchair Warrior 2 in Science & Mathematics ➔ Physics
It is not possible to exceed the velocity at which the universe is expanding, however, that is not a prerequisite for "moving forward in time".
A traveler moving at near the speed of light will age slower than one on Earth (moving slower). See the link below for a great example.
Al moved forward in time (on Earth) by 50 years in the 1.5 years of his trip.
2007-04-14 22:51:31 · answer #1 · answered by ZeroCarbonImpact 3 · 0⤊ 0⤋
If it were physically possible to exceed the velocity at which the universe is expanding? This first question I would have to answer as, probably, no. The reason I say this is because of the equation of Einstein's that energy equals the speed of light squared. One way of seeing this is to say that it is the mass of the universe that is actually creating its expansion speed. According to Hubble's law, the farther out into space we look, the faster the universe is expanding. How could you ever catch up to this 'supposed' edge of the universe? Also the universe is not just expanding in size, but also in time. If you were to attempt to travel at the 'speed of light', the first big problem that you would run into is that as you got closer and closer to that speed, you would need more and more of the universe's energy to attain it. Matter must be turned into energy in order to go that fast. It just may be that it is only because the universe is so massive, that it can expand at that rate. Your ship would have to turn into light, which I do not think is possible.
2007-04-14 23:39:40 · answer #2 · answered by haywoodwhy 3 · 0⤊ 0⤋
The recession velocity of distant galaxies is proportional to their distance. The ratio is called the Hubble constant (google for it's value). The speed at which the universe is expanding can only be quantified by the Hubble constant. The size of the universe is not known, and may be infinite, so the maximum recession velocity (what you're asking, I guess) is not known but is not limited by the speed of light. This does not violate relativity since it refers to the rate of space itself expanding, not the speed of matter within space. However, beyond about 14 billion light years, the light hasn't reached us yet since that's how old the universe is. The recession velocity of the atoms that produced that light 14 billion years ago (now microwave radiation) is close to the speed of light.
2007-04-15 05:07:30 · answer #3 · answered by Dr. R 7 · 0⤊ 1⤋
at the speed of light
and no u cant move faster than the speed of light... physically impossible (E=mc^2 ... remember)
2007-04-14 22:10:47 · answer #4 · answered by absentmindednik 3 · 0⤊ 1⤋
Dr.R thinks he knows,but like all puds.puds think they know everything.Hey pud give up on answering the questions,stick to reading your comic books or something.
2007-04-15 13:44:36 · answer #5 · answered by dikhead 3 · 0⤊ 1⤋
the speed of light!
2007-04-14 21:59:40 · answer #6 · answered by GTM 2 · 0⤊ 1⤋
everything we know about massive speeds and time altering as all theory.
2007-04-14 22:03:38 · answer #7 · answered by cyrus_xi 5 · 0⤊ 1⤋