Object faster or just as fast as light

[Irma]

What if someone designed a space ship that travelled faster than light? And they managed to prevent the space ship from crushing into another object and from disintegration (because of the speed)

[Endy0816]

9 minutes ago, Irma said:

What if someone designed a space ship that travelled faster than light? And they managed to prevent the space ship from crushing into another object and from disintegration (because of the speed)

Nothing with mass can travel at or exceed c.

Reaching a speed 'near' c, will shrink how long a journey is down to next to nothing though(assuming you and your ship can survive).

[PyriteFalcon0829]

Although you can't change the speed of light, you can change the wavelength if the light is first absorbed by a substance's electrons then put them into an excited energy state. When the electrons return to their normal ground state they will emit light of the particular wavelength corresponding to hte energy difference between the two states.

[exchemist]

57 minutes ago, PyriteFalcon0829 said:

Although you can't change the speed of light, you can change the wavelength if the light is first absorbed by a substance's electrons then put them into an excited energy state. When the electrons return to their normal ground state they will emit light of the particular wavelength corresponding to hte energy difference between the two states.

Your answer seems (a) irrelevant to the question asked and (b) does not seem to explain how the process you describe changes the wavelength, given that the light absorbed is the same wavelength as the light emitted unless certain other processes are also involved. 

 

[Photon Guy]

On 8/28/2023 at 2:32 PM, Endy0816 said:

Nothing with mass can travel at or exceed c.

Not by conventional means but there are theoretical ways of breaking the lightspeed barrier, such as if you were somehow able to move space itself and "ride" it, much like a surfer riding a wave. 

[exchemist]

32 minutes ago, Photon Guy said:

Not by conventional means but there are theoretical ways of breaking the lightspeed barrier, such as if you were somehow able to move space itself and "ride" it, much like a surfer riding a wave. 

But there is no theoretical way to move space itself.  It's a bit like saying we could all fly if we could switch gravity off. Which is sort of true, except that we can't switch gravity off.   

[Phi for All]

44 minutes ago, exchemist said:

But there is no theoretical way to move space itself.

I think they're referring to the Alcubierre metric, which doesn't actually move space but rather creates a configurable energy density field that can "push" something massive, assuming you can create a negative energy density somehow. 

[exchemist]

39 minutes ago, Phi for All said:

I think they're referring to the Alcubierre metric, which doesn't actually move space but rather creates a configurable energy density field that can "push" something massive, assuming you can create a negative energy density somehow. 

Yeah....assuming you can create -ve energy density somehow........

Which is a bit like switching off gravity, if I'm not mistaken. 😀

[Photon Guy]

3 hours ago, exchemist said:

But there is no theoretical way to move space itself.  It's a bit like saying we could all fly if we could switch gravity off. Which is sort of true, except that we can't switch gravity off.   

Space itself apparently could be moved by using objects with negative mass. The problem is finding matter that has negative mass which so far only exists in theory but it is a possibility. 

[MigL]

Energy and mass are equivalent properties.
You cannot have negative mass without negative energy, and the same arguments against their existence apply to both.
Only 'exatic' matter is postulated to have negative mass/energy, but it could be just an 'accounting' trick as it is the complement of Hawking Radiation and must be harvested just inside the event horizon of a Black Hole.
Good luck with that.

The speed a light, c , is reserved for massless particles and nothing having any mass can reach that speed.
At one time Tachyons were postulated, which move faster than light and cannot ever slow down to the speed of light, travelling backwards in time.
The term Tachyonic has recently gained a new meaning.
Particles or quantum fields with imaginary/complex mass are unstable, and said to be tachyonic.

see here          Tachyon - Wikipedia

and here         Tachyonic field - Wikipedia

[swansont]

6 hours ago, Photon Guy said:

Not by conventional means but there are theoretical ways of breaking the lightspeed barrier, such as if you were somehow able to move space itself and "ride" it, much like a surfer riding a wave. 

Any ones that don't require new physics?

[Photon Guy]

1 hour ago, swansont said:

Any ones that don't require new physics?

None that I can think of, but the point is that just because the lightspeed barrier can't be broken by conventional means doesn't mean it can't be broken period. 

[pzkpfw]

33 minutes ago, Photon Guy said:

None that I can think of, but the point is that just because the lightspeed barrier can't be broken by conventional means doesn't mean it can't be broken period. 

If new physics is required, how do you then answer the question in post #1 ?

[swansont]

1 hour ago, Photon Guy said:

None that I can think of, but the point is that just because the lightspeed barrier can't be broken by conventional means doesn't mean it can't be broken period. 

All science is provisional. But until there’s an experimentally-verified model, this is just appealing to magic.

[MigL]

Sometimes the models we build allow for predictions which are non-physical.
They are 'weeded out' by inconsistencies that arise ( you should look into some of the absurd properties negative mass would have ), or experimental observations.

[Endy0816]

On 1/29/2024 at 9:23 AM, Photon Guy said:

Not by conventional means but there are theoretical ways of breaking the lightspeed barrier, such as if you were somehow able to move space itself and "ride" it, much like a surfer riding a wave. 

c is more the point at which you run out of road in terms of distance and time.

Might be possible to bypass with something like a wormhole, but you likely can't reach/push through it due to the inherent paradox.

 

 

 

 

[Janus]

18 hours ago, Photon Guy said:

None that I can think of, but the point is that just because the lightspeed barrier can't be broken by conventional means doesn't mean it can't be broken period. 

As pzkpfw alluded to, If it requires a new, now unknown, physics to allow for FTL,  then it is pointless to speculate about what would happen, because we have no idea what rules we'd have to adhere to in this new physics.