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/sci/ - Science & Math

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1448118 No.1448118 [Reply] [Original]

So recently I was told that the reason we cannot go faster than the speed of light is because the universe itself is expanding at that speed, if not faster, and we just simply cannot out run it? Is this true or horseshit?

>> No.1448135

horse shit. we have demonstrated faster than light travel. http://www.bureau42.com/view/6841/summer-school-2010-1-quantum-physics

>> No.1448142
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1448142

>>1448118
>>1448135

>> No.1448151

Well the universe expanding at the speed of light part is correct.

>> No.1448158

horse shit

>> No.1448167

>>1448151
Actually, this is a common misconception. The universe is expanding faster than the speed of light. The lightspeed limit applies to particles, but not to spacetime itself.

As for OP's question, the fact that we can't go faster than light has nothing to do with how fast the universe is expanding.

>> No.1448186

IIRC we don't know how fast the universe is expanding
(pure speculation here)
we can't go faster then light because either our atoms would transform into energy
or we would go to the end of time (as you go faster, time slows down for you (the rest of the world evolves faster); if you go fast enough everything move as though time stands still for you - and dividing by near-zero you reach near-infinite time...)

>> No.1448192

the fact that we can't go faster than the speed of light isnt a fact at all.

>> No.1448200

>>1448192
The fact that we can't accelerate mass to speeds exceeding c.

>> No.1448364

>>1448186
What? No.

We cannot go faster than the speed of light because upon reaching that limit, the energy required to move becomes infinite.

In other words, as you run faster you use up more energy; in regards to all objects with mass, as they move faster they require more energy to maintain or increase that velocity. Upon reaching the Speed of Light, the energy required to go faster or maintain it is infinite, so it'll be impossible.

>> No.1448379

>>1448192
Except that it is. The math doesn't lie

>> No.1448375

>>1448186
>we can't go faster then light because either our atoms would transform into energy

reaction image

>> No.1448385

>>1448118
>the reason we cannot go faster than the speed of light is because the universe itself is expanding at that speed, if not faster

This universe is doing that, yes.

That's not the reason we can't go faster than light though.

>> No.1448397

There are many things that travel faster than the speed of light, as people earlier said, the expansion of the universe is much faster than it.

Also, thought. Thought travels infinitely fast. If you THOUGHT about it.

>> No.1448398
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1448398

I was under the impression it was because photons are nearly massless.

>> No.1448420

>>1448398
This.

>> No.1448443

isn't speed just relative though? if you are traveling near light speed and someone else is going towards you at near light speed then relative to him you are going well over light speed

>> No.1448445

Heres the best way to understand it. First know that if you were driving a car and the car right next to you is going the same speed as you they appear to be standing still. Now Imagine if you are on a train. And this train is continuously accelerating towards the speed of light. Now imagine there is a beam of light shigning right next to the train. As you speed up the beam of light should appear to slow down, because once you reach the speed of light it will produce the same effect as the one mentioned early with the cars. Whats astonishing though is this is not the case.Light continues to move at the same speed no matter how fast you are going proving that light does not curve around space and time, it is space and time that curve around LIGHT!!!!!

To some it up
1. The laws of physics are the same for all observers in uniform motion relative to one another (principle of relativity),
2. The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the source of the light.

That is the theory of special relativity.

Your mind has just be blown

>> No.1448448

>>1448443
The speed of light is a law. Nothing relative about it.

>> No.1448458
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1448458

>>1448445
>your mind has just be blown.

It would have..

>> No.1448497

>>1448443

No. This is what makes relativity so difficult for some people to understand. The speeds don't add up to > c.

The total relative velocity remains under c but the two travelers are instead blue-shifted to one another.

>> No.1448550

The reason most people have trouble with physics is their preconcieved notions of the world around them. Most people get lost because their teachers and professors just spout concepts and equations at them without telling them the observations and experiments they are based upon. I believe anyone can learn to understand special relativity, even basic quantum mechanics if taught properly.