Well first of all, you don't. No object that has any mass when it's sitting still will ever
travel at light speed.
To answer your question in general: If you're sitting inside a spaceship, sipping a cup
of coffee and Surfing the web, and you decide to take a break from your back-breaking
labor and step outside for a few minutes, then the moment you're outside, you continue
traveling at the same speed and in the same direction that the ship was when you let go
of it.
If the ship is traveling with constant velocity ... constant speed in a straight line ... then
you seem to float motionless next to it, because your speed and direction are exactly
the same as the spaceship's. If the ship is accelerating, then you keep the speed and
direction that you and it had when you let go, and the ship goes on its own merry way,
leaving you behind, beside, or ahead.
For the traveller, the trip takes 1 year, travelling at 60% the speed of light (or 0.6C). This would mean that he will perceive himself as have travelled 0.6 light years (a distance of about 9.46x1012km). To calculate the time that has elapsed on Earth, you can use this simplified equation: Spaceship Time = Earth Time x sqrt[1-(v/c)2] Spaceship Time = Earth Time x sqrt[1-(0.6c/c)2] Spaceship Time = Earth Time x sqrt[1-(0.6)2] Spaceship Time = Earth Time x sqrt[1-0.36] Spaceship Time = Earth Time x sqrt[0.64] Spaceship Time = Earth Time x 0.8 Spaceship Time = 1 year 1 year spaceship = Earth Time x 0.8 Earth Time = 1 year spaceship / 0.8 Earth Time = 1.25 years Thus, after 1 year has passed for the person on the spaceship, 1.25 years have passed on Earth.
Traveling to Gliese 581c, which is 20.3 light-years away, would take several decades or even centuries with current technology. The exact time will depend on the speed of the spaceship and advancements in propulsion systems in the future.
If speed approaches the speed of light, the mass of any object will increase. This is not just theory; it is observed on a daily basis. Not with spaceships, of course; the technology is not ready yet - but with subatomic particles in accelerators.
When light traveling at an angle passes from one material into another, it undergoes refraction. Refraction is the bending of light as it passes from one medium to another, due to the change in the speed of light. The degree to which the light bends depends on the angle of incidence and the refractive indices of the materials involved.
Massless particles traveling at the speed of light include photons, the particles of light. They have no rest mass and always move at the speed of light in a vacuum according to the theory of special relativity.
About 4.2 years.
To an outside observer a person traveling at the speed of light would be frozen in time. To the person traveling at the speed of light, things would seem normal.
For the traveller, the trip takes 1 year, travelling at 60% the speed of light (or 0.6C). This would mean that he will perceive himself as have travelled 0.6 light years (a distance of about 9.46x1012km). To calculate the time that has elapsed on Earth, you can use this simplified equation: Spaceship Time = Earth Time x sqrt[1-(v/c)2] Spaceship Time = Earth Time x sqrt[1-(0.6c/c)2] Spaceship Time = Earth Time x sqrt[1-(0.6)2] Spaceship Time = Earth Time x sqrt[1-0.36] Spaceship Time = Earth Time x sqrt[0.64] Spaceship Time = Earth Time x 0.8 Spaceship Time = 1 year 1 year spaceship = Earth Time x 0.8 Earth Time = 1 year spaceship / 0.8 Earth Time = 1.25 years Thus, after 1 year has passed for the person on the spaceship, 1.25 years have passed on Earth.
It will appear to slow to outside observers. That is, a twin going on a spaceship near the speed of the light will return to earth younger than his twin.
Traveling to Betelgeuse, which is approximately 642.5 light-years away from Earth, would take a significant amount of time, likely hundreds of thousands of years with current spacecraft technology. The distance is so vast that we don't have the capability to travel there at speeds that would make the voyage feasible in a human timescale.
The part about the spaceship going with the speed of light is not real. I don't understand the earlier part of the question.
Traveling to Gliese 581c, which is 20.3 light-years away, would take several decades or even centuries with current technology. The exact time will depend on the speed of the spaceship and advancements in propulsion systems in the future.
If speed approaches the speed of light, the mass of any object will increase. This is not just theory; it is observed on a daily basis. Not with spaceships, of course; the technology is not ready yet - but with subatomic particles in accelerators.
a spaceship. Or the light. I think that is the fastest thing.
Like any traveling it depends on how fast you are going, slowly will take quite a long time, yet very very fast will get you there a lot more quickly. if you travel at the speed of light it will take about 8 minutes.
In theory you would not see them because there is no way of the light getting to you because for that to happen you would need to travel slower than the light or the light would have to be coming from the opposed direction
I have the impression that light is not affected by magnetic fields - at least in a vacuum. If traveling through other substances, the magnetic field can change the light's polarization.