Questions tagged [space-travel]

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Why don't spacecraft accelerate to the speed of light, or just fractionally below that?

In space there is almost nothing to slow you down, and your proppelent/S will always be traveling relatively faster than your craft so you should accelerate infinitely close to the speed of light ...
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1answer
38 views

Apparent temperature of the universe at relative speeds

Suppose you are in a vessel traveling at relativistic or near relativistic speed relative to your local galaxy--whatever is physically reasonable, and won't get rapidly torn apart by high energy ...
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30 views

What mechanism in the tidal effects around a black hole is it that destroys materia?

I just read this Quora question https://www.quora.com/Why-doesnt-NASA-send-a-probe-into-a-black-hole-to-learn-more and although the basic premises for the question are flawed (travel time is ...
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3answers
72 views

how do we navigate space without knowing the position of everything? wouldn't the gravity affect the sattelite/ship?

I tried looking for other questions but I couldn't find any. (if this is a duplicate, then I'm sorry, I just signed up, so I'm not sure what to search for) I was wondering, how do we navigate into ...
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0answers
45 views

A question about almost stationary orbits

For an orbit around the earth with period equal to a sidereal day with eccentricity $e=0$ and inclination $i=0$, the path on earth would be a single point on the equator. I have done some simulations ...
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1answer
246 views

Is the Andromeda Milky Way collision the most likely form of intergalactic space travel?

Assuming that some form of sentient organization gradually spreads within the Milky Way through technology predicated on currently known physics, is the Andromeda-Milky Way collision in 4 billion ...
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2answers
54 views

What are the options the human civilization will have before Sun gets brighter by 40% within next 3.5Billion years? [closed]

In next 3.5 Billion years, the sun will become 40% brighter, causing the oceans to dry up, and conditions for life sustainability shall become so critical that human must leave our solar system ( or ...
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1answer
32 views

How will the Starshot swarm accelerate perfectly?

I was reading about the Breakthrough Initiative Starshot and I a question came to mind. From my understanding, the "mothership" will focus powerful lasers on each of the tiny ships, accelerating them ...
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1answer
91 views

How do we create “gravity” in a generational spacecraft? [closed]

This is part of a conceptual art discussion about various ideas for generation spaceships. I submitted that the only reason I "weigh" 80 kg is because I have the mass of planet Earth the other side of ...
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1answer
102 views

Rapid deceleration of the spaceship with the help of black hole [closed]

Could a spaceship traveling close to the speed of light (ok, maybe speed is not relevant for this question) decelerate (almost stop) very quickly (say, on a safe distance) with the help of a very ...
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0answers
58 views

Relativistic Turning: Most efficient strategy?

Say I have a ship that can go something like 99.999997% C, and has a very, very large amount of energy at its disposal (essentially beamed to the ship from elsewhere), but not unlimited. I want to ...
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1answer
109 views

Why can't we prepare the moon for colonization by shipping oxygen to its atmosphere?

Why can't we take oxygen to the moon in order to civilize it? We can store oxygen in rockets then take them to moon and release it there. Even if the moon's gravity is weak, it will hold on to the ...
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0answers
22 views

How do spacecrafts get a gravitational boost from planets? [duplicate]

I have heard that the Voyager spacecrafts received gravitational boosts from some of the planets before they left the solar system. How is this achieved? Since we have to conserve energy it seems ...
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3answers
346 views

Rapid acceleration and deceleration of Space X's BFR

Given that momentum is the product of speed and weight (Velocity x Weight) would rapid deceleration or acceleration in weighless space, of Space X's BFR have an impact on its passengers. I ask because ...
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1answer
83 views

Travel huge distance in a short time

I know that according to the thought experiment by einstein, one who would travel at speed close to light's speed would not age and those on earth would age. But is it possible for someone to travel ...
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2answers
150 views

Artificial gravity through centrifugal force while traveling very fast in vacuum

So, if you've ever read a sci-fi book you've seen it before probably: a ship like "babylon 5" (or the ship in "2001 A space odyssey" ) which rotates and creates artificial "gravity" by using ...
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1answer
138 views

If Proxima Centauri is only 4.25 light years away, why is there no attempt at communication? [closed]

It is known that the Proxima Centauri star system is merely $\approx 4.25$ light years away from Earth. Moreover, an Earth-like planet has been discovered around Proxima B that is within the habitable ...
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3answers
678 views

Comparison of G force in space with G force on Earth

I was reading another question on here where the general answer was that the G force would be the same on earth as it would be in space, this is the Q & A link: Can a pilot in a small spaceship ...
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93 views

Calculating trajectory of ballistic spacecraft

I have a scenario of a spacecraft departing from the far side of Mars (from Earth) at a particular date arriving at Earth at a particular date, without acceleration after launch I would like to know ...
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3answers
1k views

Parker Solar Probe passing extremely close to the Sun; what relativistic effects will it experience and how large will they be?

note: This is a question about relativistic effects. I've included some detail about the spacecraft and its orbit for background, but the question is about relativistic effects and their observability....
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2answers
401 views

Which frame of reference to use when calculating time dilation?

First of all, I'd like like to apologise. I'm not a physicist so it's gonna be an uphill struggle with explaining some concepts to me ;) I think I understand the math behind time dilation between ...
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1answer
30 views

does thrust have to come from a balanced area on an object for straight trajectory in a vacuum?

I was just thinking about theoretical space craft. If a ship never left space, does it have a center of gravity when flying? For example, do the thrusters need to be in the middle rear of the ship, or ...
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1answer
2k views

Exotic Matter: Stabilizing Wormholes

Background I know wormholes are still hypothetical but this is pertaining to exotic matter and it's effect on wormholes. Reading through various sources, they all specify that if wormholes exist, ...
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1answer
233 views

Using a gyroscope to get to space

Theoretically, if you could get an inertial mass or gyroscope spinning fast enough while on the earth' s surface, then as the earth turned would it continue to travel in a straight line and therefore ...
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1answer
164 views

Force Drag and impact kinetic energy on relativistic spacecraft

Assuming a relativistic rocket travelling at 0.95 times the speed of light (c), what would be the drag force on the cross-section area $(\pi500^2)$ of the ship facing the direction of travel assuming ...
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1answer
37 views

Gaining speed for further space travel [closed]

With the recent discovery of the new solar system with viable planets for sustainable life, a thought of prior discussions intrigued me. Now, please understand that I have no engineering background, ...
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0answers
44 views

Do Solar Cells Regenerate After Exposure to Ionising Radiation?

In the past, plenty of research has been done on the effects of ionising radiation on solar cells. This is due to the importance of high efficiency solar cells for electric spacecraft propulsion. Such ...
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4answers
161 views

Different approach of time dilation explanation

Suppose you are going to a distant star, and there is an observer on earth. Usually the answer to the question how long would it take to travel to a distant star is explained this way : You cannot ...
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2answers
395 views

Could Dark Matter be used as reaction mass for a propulsion device?

Assuming a best case scenario, where humans are able to discover a way to interact with Dark Matter, could we use dark matter like a row boat uses the water? Assuming Dark Matter is made of WIMPs, ...
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1answer
761 views

Do you travel in the 5th dimension? [closed]

If you travel freely through the first 3 dimensions, and you travel in a singular direction through time, how do you travel through the other dimensions, like the 5th?
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0answers
22 views

Moving away from an object when using space-time distortion (very theoretical)

This is a very theoretical question I was thinking about lately and I don't think this has been asked before yet here, otherwise please point me to the appropriate Q&A. And I'm not talking about ...
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1answer
1k views

Is space travel really possible?

Just a thought, does not relate to actual physics If the universe is really expanding, then if we send probes to distant locations in the universe with earthly data, then will the probes ever reach ...
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2answers
51 views

Binary satellite system to approach low orbit

After hearing the exciting news about discovery of a new earth like planet, It is becoming more of an urgent need to come up with more efficient ways of sending probes to investigate new planets. ...
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1answer
171 views

Would this ship travel faster than light [closed]

Im curious about using a geometric thruster system to break the speed of light barrier, Using a system of beams that rotate along alternating axis' from either end of themselves so as to travel a ...
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1answer
131 views

How do gravitational sling shots work? [duplicate]

How can an object move faster after leaving the gravity of a planet, should a gain in potential energy by moving away from the planet lead to a loss of kinetic energy? Or am I missing something ...
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3answers
196 views

Can we make high acceleration safe to our bodies thanks to this gravity trick?

According to Wikipedia, a human body can resist g-force of about $5 g$. It can be a greater value in some circumstances, but even as low as $2 g$ would be unpleasant after several seconds. This means ...
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1answer
272 views

Law of conservation of linear momentum (Nuclear Engine)

Suppose there is a isolated system in which there is only one stationary rocket. As the rocket is in a stationary position the initial momentum will be 0, now the nuclear engine is started, as a ...
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0answers
135 views

Space travel and time dilation

I want to know how long it takes, from an observer in a spaceship moving at constant velocity $v=\beta c$, to cover a distance $d$. From a stationnary observer outside, the spaceship goes at a ...
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2answers
90 views

Could vacuum chambers lighten the load for space bound technology?

Would cavities of near vacuums in the head (or in the 6 x 6 blocks surrounding the rocket [for reentry temperatures]) of a rocket make it lighter so it can be sent out easier?
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1answer
107 views

Does increasing the energy of a relativistic particle increase thrust?

I know this particular chestnut has been asked before, but I have a specific variation on the theme: Particle accelerator space thrust. Specifically, cyclotrons to generate the thrust. They are ideal ...
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3answers
179 views

Magnetism in space

I am not an expert when it comes to physics. I was looking at maglev technology the other day and a thought crossed my mind. Would similar systems work for deep space exploration. I understand ...
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1answer
80 views

How do they know their velocity in a spaceship? [closed]

Suppose a spaceship is going to Mars or to Jupiter, they switch on their thrusters and accelerate for a certain period, how to they know their position / velocity, do they refer to the Sun?
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3answers
219 views

What the live streaming of a time traveler will look like?

Consider a hypothetical situation: In which a time traveler travels in a spaceplane at close to speed of light circling the earth and I get a live telecast of inside of that plane to my television. ...
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3answers
123 views

Is it possible to travel near light speed and not notice relativity?

Suppose I have no idea about relativity and find an ancient spaceship that takes me to Proxima Centauri in just 1 year more than it takes light to make the trip (so some observer might say it took ...
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0answers
406 views

Will future spaceships for very long distance rotate?

I have seen in the movie Interstellar and The Martian they use the model of spaceship which rotate around it's axis. This is the spaceship model from Interstellar. This is spaceship model from The ...
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2answers
152 views

Where is the space elevator falling? And the cable holding it?

I guess the concept of a space elevator is pretty well known. The idea, first published by Konstantin Tsiolkovsky in 1895, and popularized (among others) by Arthur C. Clarke in The Fountains of ...
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1answer
178 views

Do stray photons become interstellar daggers to a space traveler near the speed of light?

Suppose I am traveling through space, accelerating closer and closer to the speed of light. As I speed up, photons traveling towards me become blue-shifted to higher and higher frequencies. When I am ...
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1answer
647 views

Gravitational Time Dilation vs Acceleration Time Dilation

I might be a little dense to this subject, but I would like to ask a question relating to this one ( Is gravitational time dilation different from other forms of time dilation? ) but asking if this ...
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2answers
134 views

Is there a most efficient speed to travel in space with reference to time dilation? [closed]

I was thinking hypothetically, a ship traveling to a distant star system with something like food wants to get to the system as fast as possible. The trick is, we want to travel as fast as possible in ...
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1answer
71 views

How much gravity (and/or magnetic field) would a space ship need to generate to hold an atmosphere around it? [duplicate]

Say you wanted a ship to have a bubble of atmosphere around it, 800m in diameter with the ship at the center. What sort of gravity (and perhaps magnetic field) would be needed? Would either of these ...