Linked Questions

2 votes
0 answers
280 views

Given limits on acceleration for human space flight, what are the minimum travel times in our solar system for real powered journeys? [duplicate]

The human body has a limit of being able to withstand, roughly, 2g for very long periods without causing too many health problems. An engine technology, that could produce constant thrust producing ...
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25 votes
4 answers
15k views

If human space travel is limited by the G force vulnerability, is there a way to counter G forces?

I read somewhere that prolonged G forces (even 2 Gs) are not tolerated by human physiology and that this ultimately limits our ability to sustain space travel. Are there any tactics to reduce G force ...
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  • 275
25 votes
4 answers
19k views

Why can't spaceships just accelerate to create gravity?

The answer to What happens to an astronaut who's floating in a spaceship (in space) when it begins to move? is that we can create g-force just by accelerating. So then why go all the way to create ...
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  • 353
26 votes
3 answers
6k views

Are there any greater risks of traveling significantly faster to another planet?

Earlier I had thought that space ships can strike against space rocks while traveling to another planet. But I've read that space is vastly empty, it's highly unlikely that something will come in the ...
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  • 369
16 votes
2 answers
4k views

Space travel using constant acceleration drive: Earth to Europa

Long story short: I'm writing sci-fi and taking my protagonist to Europa. He's got 2 weeks to one month to get there from Earth, give or take a few days. That sounds, of course, preposterous in this ...
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5 votes
4 answers
2k views

Would it be possible with a light-speed ship to reach intergalactic space in a human lifetime?

I have one issue coming out of one conversation between me and my roommates (none of us professional in the subject of space)! If one had a ship which could approach light speed, could one reach ...
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  • 179
2 votes
2 answers
696 views

How should I scale the Solar System for my video game?

I am making a multiplayer video game, and am wondering how I should scale the in-game universe. The game has pseudo-realistic travel, but I want the scaling to be large enough to offer challenging ...
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1 vote
1 answer
1k views

3-5% lightspeed?

I recently saw a documentary about Project Orion - nuclear pulse engine - that would reach a staggering 3-5% of the speed of light. How long would a ship take to get to Mars, Jupiter, and Saturn at ...
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  • 343
1 vote
1 answer
1k views

What would be required to fly four astronauts at constant 1G to Mars? [closed]

Is it technically possible to build a ship that could keep a constant 1G acceleration / deceleration on a flight from Earth to Mars? What could provide energy? What could provide accelerant? (I am not ...
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3 votes
1 answer
351 views

Estimating thrust and kg fuel for a generation ship's journey to Alpha Centauri

Premise: A generation spaceship leaves Earth around the year 2060 on a journey to colonize Alpha Centauri A (ACA). In this fiction, fusion power is achieved in 2040, improved over 20 years, and used ...
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  • 181
3 votes
1 answer
161 views

Calculating the propellant needed for a trip from LEO to Low Mars Orbit at constant acceleration of 1g

I’ve been trying to calculate how much propellant a spaceship from Earth /LEO/ to Mars /LMO/ at constant acceleration of 1g would need. Here’s the data given: dry mass mf=100 t; g=9,81 m/s^2; Isp=...
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  • 73
0 votes
1 answer
255 views

Constant Acceleration in Space. How much time for a given distance?

I have been researching a lot and can't make any sense of it all, so I am trying my luck here. I want to program a simple formula that gives me the travel time in space. I have a constant thrust of ...
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