Questions tagged [space-travel]

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Travelling in outerspace

Firstly, is it correct that for travel in outer space, the distance that can be travelled with a given amount of fuel is determined by the energy required to overcome the following forces: gravity ...
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1answer
118 views

From a traveler's point of view, what prevents him from reaching speed faster than light? [duplicate]

From a traveler's point of view, as he is accelerating with $1g$, in under one year he would reach the speed of light. Note that from his point of view, everything looks normal so he could keep ...
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5answers
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Constant $g$ acceleration from astronaut's frame of reference

When a spaceship is experiencing a constant acceleration of $10m/s^2$, the astronauts will be moving at nearly the speed of light after about a year in the earth's reference frame. This means the ...
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1answer
38 views

Do radioactive objects accelerate in space?

Americium tends to radiate mostly as alpha particles. It would seem to me that as particles irradiated away, they would transfer momentum and the object would accelerate in the opposite direction. If ...
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0answers
51 views

Why can't we fly aeroplane or shuttle directly into the space (beyond 100 km height above Earth's surface)? [duplicate]

Without rockets can we go beyond Karmans line by shuttle or plane?
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0answers
59 views

How to interpret doppler curve images of Chandrayaan-2 lander?

The frequency transmission data for Vikram, lander of Chandrayaan-2, received by 25 meter Dwingeloo radio telescope is plotted and tweeted by Cees Bassa. Kinks in the Doppler curve are interpreted as ...
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2answers
123 views

Simplified calculation of the amount of fuel required for a trip — are my calculations faulty?

I've been always fascinated with how easily scifi characters travel around the Solar system and sometimes the galaxy. They just hop into a spacecar and go wherever they want. So I've come up with a ...
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30 views

How to travel between two stationary worlds in the least amount of proper time?

I was intrigued by this question about minimizing the travel time between two worlds that are at rest with respect to each other, and disappointed that the answer turned out to be trivial. However, I ...
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4answers
3k views

How to travel between two stationary worlds in the least amount of time? (time dilation)

Let's imagine there are two, isolated, stationary worlds in space (called A and B), very far apart from each other. I live on World A, and some aliens live on World B. I want to learn about the ...
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1answer
66 views

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
39 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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0answers
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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
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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
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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
281 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
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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
38 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
264 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
114 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
60 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
112 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
450 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
169 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
146 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
871 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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0answers
102 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
2k 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
537 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
279 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
190 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
40 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
46 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
171 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
532 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
847 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
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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
54 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
186 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
149 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
206 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
288 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
136 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
92 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
116 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
181 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 ...