# Questions tagged [relativistic-rocket]

Questions regarding spacecraft with a velocity some significant fraction of *c*. (The speed of light)

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### Is it possible to create a relativistic space probe going at least 0.1c with present day technology?

That's pretty much it: Is it possible to create a relativistic space probe going at least 0.1c with present day technology? Present day meaning as of April 2020. If it is actually possible, how ...
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### How do you calculate the percentage of light-speed a ship with a certain delta-v can achieve, accounting for relativistic effects?

I was doing some back-of-a-postage-stamp calculations on high-isp interstellar spacecraft earlier and realised something. If I design a spaceship which according to the rocket equation has a very high ...
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### Relativistic Rocket Equation

I am familiar with using Tsiolkovysky's Rocket Equation, $$\Delta v=v_{e} \ln \left(\frac{m_{i}}{m_{f}}\right)$$ However, after trying to work out an exhaust velocity needed in a hypothetical ...
28 views

### Velocity of a charged particle due to electric field in relativistic limit [closed]

I am trying to calculate the velocity of a charged particle moving through a constant E field. I understand that I can set $\frac{1}{2}mv^{2} = qV$ to give $v = \sqrt{\frac{2Vq}{m}}$ However, im not ...
226 views

### At what speed does it seem like you are going lightspeed due to time dilation?

Due to relativity, if you are onboard a ship going at 99.999% the speed of light, it seems to you that you travel multiple light years per year, even though from an outside perspective you take just ...
459 views

### About non-FTL travel and realitivistic effect for a hard sci fi novel

I’m planning a hard science fiction novel, thus there is no Faster-Than-Light travel, but I do present the existence of a means of transportation that is close to the speed of light. For example, it ...
8k views

### Time at 1 g acceleration to travel 100 000 light years

How long would it take to go 100,000 light years at a constant 1 g acceleration?
289 views

### Is there a general relativistic relativistic rocket equation?

I am not to familiar with rocket equations but I know that if you combine special relativity with classical mechanics you get "c" as a speed limit. Basically the closer you get to "c" the more you ...
25k views

### A starship is travelling at 0.9c and collides with a small rock. Will it leave a clean hole through, or will more happen?

Say there is a football sized rock in the path of the ship. Will it create a football sized hole through the ship in the blink of an eye, or will more happen? The ship would be filled with metal, ...
109 views

### Relationship between propellant mass and thrust at relativistic speeds

When answering this question about relativity and delta-V I realized I don't know the relationship between the mass of propellants and how much delta-v they would produce in an engine at relativistic ...
245 views

### Backwards time dilation paradox [closed]

We have a pair of atomic clocks. Let's call them clock A and clock B. We switch both of them on at the same time. Clock A will stay on Earth and clock B will go with the astronauts. Astronauts with ...
318 views

### continuous acceleration in space

If you had a rocket with unlimited fuel and it was continuously firing, would the rocket keep accelerating to a faster and faster speed, or is there a speed limit where acceleration stops
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### A laser can propel a spacecraft to 20% of light speed, time shorter on spacecraft?

So I recently learned about a project about using lasers on Earth to propel a spacecraft to 20% of light speed for interstellar traveling. So this brings an interesting question, how much shorter ...
With ISp defined as ${v_e}\over{g_0}$, the naive approach would tell me, the maximum possible specific impulse, with propellant moving at speed of light relative to the craft, is $c\over{g_0}$ or 30,...