idea

[eino olavi!]

 

`evr time we trye to solve faster then light speed traveling why not simply try to travel from world to another world like in one weeek not actualy traveling faster then light speed 

 

[iNow]

Because even when going the fastest speed there is it takes years to cover the distance

[Janus]

2 hours ago, eino olavi! said:

_{evr time we trye to solve faster then light speed traveling why not simply try to travel from world to another world like in one weeek not actualy traveling faster then light speed} 

 

From world to world, do you mean star system to star system or between planets in the Solar system? 

To travel from world to world in our solar system in a week doesn't require speeds anywhere near light speed (though with present technology, it would require impractical amounts of fuel.  To get to Mars when it is at its closest would 2.24e12 kg of mass for every kg you want to deliver to Mars. If we assume a craft with an mass equivalent to what we sent to the Moon with the Apollo missions, it would take an amount of fuel equal to the mass of one Jupiter's small moons.

If you mean star to star, then you have to ask:  One week as measured by who.  There is just no way to get to even the nearest star in a week as measured by the Earth without going faster than light (it takes light 4.3 years to travel the distance)

But due to Relativistic effects, if you could travel close enough to the speed of light, you could make it in 1 week of ship time.  But to do this would require reaching 99.9989999% of the speed of light.  The amount of fuel needed to do that with today's technology exceeds the mass of the observable universe.  Another problem is that even if you could find a type of engine that could reach that speed with a reasonable amount of fuel, the acceleration needed to reach that speed in so short a time would flatten any passengers into jelly.

[Sensei]

 

1 hour ago, Janus said:

Another problem is that even if you could find a type of engine that could reach that speed with a reasonable amount of fuel, the acceleration needed to reach that speed in so short a time would flatten any passengers into jelly.

With normal human acceptable 1g acceleration, spaceship can reach near speed of light in one year.

https://en.wikipedia.org/wiki/Space_travel_using_constant_acceleration

"From the planetary frame of reference, the ship's speed will appear to be limited by the speed of light—it can approach the speed of light, but never reach it. If a ship is using 1 g constant acceleration, it will appear to get near the speed of light in about a year, and have traveled about half a light year in distance. For the middle of the journey the ship's speed will be roughly the speed of light, and it will slow down again to zero over a year at the end of the journey."

 

[Janus]

2 hours ago, Sensei said:

 

With normal human acceptable 1g acceleration, spaceship can reach near speed of light in one year.

https://en.wikipedia.org/wiki/Space_travel_using_constant_acceleration

"From the planetary frame of reference, the ship's speed will appear to be limited by the speed of light—it can approach the speed of light, but never reach it. If a ship is using 1 g constant acceleration, it will appear to get near the speed of light in about a year, and have traveled about half a light year in distance. For the middle of the journey the ship's speed will be roughly the speed of light, and it will slow down again to zero over a year at the end of the journey."

 

In a year(ship time) You would reach ~0.77c  After traveling 0.56 ly.  assuming you used another year and another 0.56ly to slow back down,, That leaves 3.18 ly to travel at 0.77c. to reach the nearest star.  That takes 4.13 yrs earth time and 2.64 yrs ship time.  Total ship time trip to Alpha C is 4.63 yrs . Total Earth time is 6.54 yrs.  A far cry from the  1 week suggested by the OP.

To achieve the 0.99998999 c needed to cross 4.3 ly in one week (ship time) by accelerating at 1g,  you would have to spend almost 6 years ship time. 

[J.C.MacSwell]

If you have a large enough mass space ship, and the technology to accelerate it as much as needed, you can drag around "normal humans" without crushing or spaghettifying them, by controlling their distance from the bulk of the mass.

So possible in "theory".

You accelerate them gravitationally, so it's all about the gradient or tidal forces.

[swansont]

24 minutes ago, J.C.MacSwell said:

If you have a large enough mass space ship, and the technology to accelerate it as much as needed, you can drag around "normal humans" without crushing or spaghettifying them, by controlling their distance from the bulk of the mass.

How, exactly?

[J.C.MacSwell]

2 minutes ago, swansont said:

How, exactly?

You keep them in the +/- 1 g (or so) range from the bulk mass...meaning you need to get them closer to it for greater accelerations.

To decelerate significantly you need to do the same but turn the ship around. (placing people on the other side of the bulk mass)

As indicated you need to provide the means to accelerate the whole thing and the design is fairly open.

Clearly the mass would need to be well above that of the Earth, even if the density is significantly greater, and exotic materials would no doubt be helpful...but exactly and actual design is up to you...(or whoever might like to write a Sci-fi using the concept)

[swansont]

9 minutes ago, J.C.MacSwell said:

You keep them in the +/- 1 g (or so) range from the bulk mass...meaning you need to get them closer to it for greater accelerations.

To decelerate significantly you need to do the same but turn the ship around. (placing people on the other side of the bulk mass)

As indicated you need to provide the means to accelerate the whole thing and the design is fairly open.

Clearly the mass would need to be well above that of the Earth, even if the density is significantly greater, and exotic materials would no doubt be helpful...but exactly and actual design is up to you...(or whoever might like to write a Sci-fi using the concept)

If you are accelerating the ship at 10g, how do you have the people experience 1g?

[J.C.MacSwell]

Just now, swansont said:

If you are accelerating the ship at 10g, how do you have the people experience 1g?

Put them in a position behind the bulk mass, where if it were not accelerating they would experience 9g.

Or 11g

[swansont]

35 minutes ago, J.C.MacSwell said:

Put them in a position behind the bulk mass, where if it were not accelerating they would experience 9g.

Or 11g

Ah, ok, they’re in a rocket, pulling 10g but the bulk mass is exerting 9g.

[Sensei]

On 1/5/2020 at 9:46 PM, Janus said:

In a year(ship time) You would reach ~0.77c  After traveling 0.56 ly.  assuming you used another year and another 0.56ly to slow back down,, That leaves 3.18 ly to travel at 0.77c. to reach the nearest star.  That takes 4.13 yrs earth time and 2.64 yrs ship time.  Total ship time trip to Alpha C is 4.63 yrs . Total Earth time is 6.54 yrs.  A far cry from the  1 week suggested by the OP.

To achieve the 0.99998999 c needed to cross 4.3 ly in one week (ship time) by accelerating at 1g,  you would have to spend almost 6 years ship time. 

Conclusion?

Don't forget your cat!

Just in case you would get lost in the middle of the galaxy..

ps. Love goes to Ripley.. 😙  (and Jonesy obviously too)

 

Edited January 6, 2020 by Sensei