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Questions tagged [escape-velocity]

The speed needed to "break free" of the gravitational attraction of a body without spending more propellant.

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1answer
73 views

How to achieve escape velocity from Ceres?

If I am interested in a sample return mission to Ceres using a similar propulsion technology package to Dawn, what kinds of additional propulsion would be required to land and then return? ...
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1answer
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Largest radius sphere with Earth's surface gravity on which you could jump at escape velocity? Bigger than B612?

In the book Le Petit Prince by "French aristocrat, writer, poet, and pioneering aviator Antoine de Saint-Exupéry" the main character lives on an extremely tiny asteroid with the name B612. It is this "...
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2answers
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Could a human jump off Mimas without return?

A similar question has already been asked on dwarf planet Ceres: Could a Human reach escape velocity by jumping from the surface of Ceres (a dwarf planet)? Ceres has 2.9% of Earth's gravity. Saturn's ...
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How could an object barely exceeding escape velocity from the Moon eventually reach the Earth?

Since NASA is once again targetting low-cost missions to the Moon, I was thinking about low-cost methods of getting stuff from the Moon back to Earth. Although it seems reasonable to assume that ...
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How much Delta-V would be required to escape the Gravitational Influence of the Earth without entering orbit?

As impractical as it sounds (and it's definitely impractical) I was wondering what the Delta-V required to leave Earth's influence would look like if we launched "just straight up" into the Earths ...
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1answer
568 views

Apollo 11 mission report shows velocity well below escape velocity thousands of km on the way to the Moon

This is from the Apollo 11 mission report. It says the vehicle was going at 7.6 km/s when the CSM separated from the third stage. It was not in orbit at this point, it was thousands of KM from earth. ...
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benefits of higher rocket speed [closed]

what benefits will a rocket get if it is made to go at a speed close to light... like 3 X 10^6? if the rocket is supplied with more efficient fuel and designed to obtain lesser drag there are ...
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At what gravity would the rocket equation mean “cannot reach orbit from the surface”? [duplicate]

I remember reading (a long time ago in a library far, far away...) that, if Earth's gravity were that much stronger, the rocket equation (?) would mean that it were impossible to actually reach orbit ...
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How did the Roadster get high enough to take a whole-Earth picture?

According to telemetry as seen in videos of the event, the car was ejected from the Stage 2 rocket at 114km above Earth. Anything less than 160km will immediately enter a rapidly decaying orbit and ...
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2answers
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Could Starman get ejected from the Solar System?

This is not about a prediction of Starman's fate, although it might be interesting to find it so. This is about any object having similar aphelion and perihelion values to Starman (Elon Musk's Tesla ...
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10answers
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How many times do you have to circle the Earth to break orbit?

My science teacher asked us this, and nobody in my class knew. We guessed it would be three, but with no evidence. (Edit: The asker has not returned to clarify if they meant leaving the Earth-Moon ...
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1answer
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What speed did the (interstellar) comet C/2017 U1 PANSTARRS have at perihelion?

C/2017 U1 PANSTARRS is a comet with an eccentricity of close to 1.2, so it is a strong candidate for having interstellar origin. It's perihelion was at 0.25 AU. What speed did it have relative to the ...
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Is there a theoretical limit to the size of launch vehicles?

Is there a limit to the size (mass, structural issues) of boosters that can be launched either to orbital or escape velocity? I am asking about such constraints as the required thrust to weight ratio ...
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Would it be possible to go beyond Jupiter without making any slingshot?

It is said that we do not have such advanced technology in order to send a spacecraft out of the solar system. (Source: Everyone around) When a spacecraft is launched from Earth and aims to leave the ...
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2answers
359 views

How do we come up with the gravity assist (or slingshot) formula?

When you search up in google gravity assist formula, it comes up with the simplest version: Which means that: Final velocity = Initial velocity + 2 (velocity of the planet) Then if we do some more ...
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What is the characteristic time to reach a hyperbolic excess velocity within a sphere of influence?

When departing a planet using a hyperbolic trajectory, one should ideally reach the sphere of influence boundary with an excess velocity needed for interplanetary transfer. Of course, the true excess ...
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1answer
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What factors determine how long a window of opportunity opens for an interplanetary hohmann transfer?

I know that one can determine the approximate wait time for a window of opportunity to open up for an interplanetary transfer based on the relative positions and velocities of the two planets in ...
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1answer
813 views

Roughly, how fast do rockets travel?

I know that different rockets are built with different a range of different sizes or purposes, but there must be some kind of range of typical speeds for those things when leaving the Earth. So how ...
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1answer
4k views

Does escape velocity apply to rockets? [duplicate]

I know so far that escape velocity on the surface of Earth is 11.2 km/s Wikipedia says that escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a ...
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Isn't the escape velocity for the solar system at the Earth 42.1 km/s? Then why does the graph show 36 km/s for the same value? Is the plot wrong? [duplicate]

The graph shows that 36 km/s is the escape velocity of the solar system at the Earth. But if we do some calculations, we will get 42.1 km/s as the right answer. I have been checking all other escape ...
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3answers
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Payloads pulled into orbit/space [closed]

The way soldiers meet a wall in an obstacle run; they boost 1 or 2 of the team up to the top and then those up there help pull their colleagues up and over. Just wondered if there might be a way ...
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Why is an escape velocity needed? [duplicate]

This is probably a stupid question, so I apologise in advance, but why is it that you need to achieve a certain speed to leave the planet? I understand that an orbit needs a speed so that when you ...
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3answers
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How could we make a fair comparison between space rockets regarding their payload mass in low Earth orbit and Earth escaping?

I was searching for comparisons between space rockets regarding their payload mass in low Earth orbit and Earth escaping. First one to see capability of the space booster (the first stages) and second ...
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1answer
123 views

Neutrinos travel faster than the speed of light [closed]

If neutrinos travel faster than the speed of light does the calculation for the speed of light become obsolete. IE is there now a new formula for calculating speed/velocity through space/vacuum.
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2answers
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Why can't ion engines be used for launch? [duplicate]

Not to sound rhetorical but if a Ion engine was used it would start at 1 mile an hr and then the speed would continue exponentially. So theoretically wouldn't that make it possible to break free ...
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1answer
332 views

Is space travel possible from a large planet? [duplicate]

I was playing with a rocket design simulator, and I noticed that if I set Earth's gravity to be much higher than it is today, it became impossible to design a rocket that could reach escape velocity. ...
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1answer
82 views

Can I avoid a magnetar with an electromagnet?

Magnetars are generally accepted as existing. Wikipedia suggests that the magnetic forces are strong enough to kill you. I am assuming that virtually any spacecraft would have some magnetic ...
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4answers
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How much bigger could Earth be, before rockets would't work?

hint: Apparently the Tsiolkovsky rocket equation does not actually say that you can launch a conventional rocket into orbit around an arbitrarily large and massive body. Question: "How much bigger ...
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1answer
182 views

Laniakea Delta-V and Escape Velocity

We live in the Laniakea supercluster. Galaxies including the Milky Way are being pulled toward the "Great Attractor" in its center. Two questions (note that the answer to one can be used to derive ...
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2answers
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Why can't deep-space missions escape orbit by skipping off the atmosphere?

If skipping off the atmosphere during re-entry runs a real risk of of the spacecraft "escaping" from orbit, why don't deep-space missions use this method instead of using power to reach escape ...
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3answers
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Is it possible to launch picosatellite into orbit from railgun on high-altitude plane?

Is there some combination of a plane that flies high enough, with a railgun small enough to fit into the fuselage, and a satellite small and durable enough, to make this feasible?
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1answer
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How are fuel requirements different for different types of orbits?

In theory, the orbit around a single mass always has the same amount of total energy (Kinetic + Potential). Therefore, if a satellite was launched from earth, it should always require the same amount ...
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1answer
306 views

What is the escape velocity of Saturn at Enceladus distance?

To what velocity would a spacecraft have to accelerate to launch from the surface of Enceladus into orbit around it? And from the orbital distance of Enceladus, what would be the escape velocity from ...
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0answers
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Limitations of gravitational assist flybys

My understanding is that it's easier to send something out of the solar system than into the sun due to the need to overcome the speed at which the earth moves around the sun. My understanding of ...
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4answers
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Why did Voyager 2's velocity drop far below escape velocity before the first gravity assist?

As per @kasperd's comment on another question. Looking at the graph below, it appears that Voyager 2 started at just over escape velocity of the solar system. Just before the Jupiter flyby, it was ...
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2answers
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How much thrust to launch a regulation size FIFA soccerball into orbit

How much thrust is necessary to launch a regulation size FIFA soccer ball into orbit around the Earth? Let us assume a size 5 which weighs between 420g and 450g. Remember, we will need thrust to ...
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2answers
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How to calculate the sphere of influence radius of the sun and other stars?

I am creating a space exploration game and I'm gathering formulas for determining how the player's spacecraft will act in space. One thing I need to know is how to calculate how far a spacecraft can ...
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How far away will I get if I'm --just under— escape velocity?

The escape velocity of earth is about 11.2 km/s. Let's say it was, for the sake of argument, exactly 11.2 km/s. If I go 11.199999 km/s, I'm going to fall back down to earth. But how can I determine ...
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How close was Philae to escape velocity during its first bounce?

ESA indicates that the first bounce lasted two hours and reached a height of 1 km. With the extremely weak surface gravity and low escape velocity of the body (< 1 m/s), and other publicly ...
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4answers
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Is non-evacuated tube maglev launch possible? [duplicate]

I heard about evacuated tube transportation technology and it's application to launch cargo or even shuttles to space. Example of such project would be StarTram. The fact that acceleration phase to ...
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1answer
779 views

How many satellites/probes will or have travelled outside the solar system?

How many human made satellites/probes have been directed outside of our solar system (or are currently within the solar system which in time will travel outside)? Is there a source that shows ...
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10answers
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Couldn't I escape Earth's gravity traveling only 1 mph (0.45 m/s)?

It is said that in order for an object or a projectile to leave Earth's gravitational pull, it must reach Earth's escape velocity, meaning reach a speed of 7 miles per second (~11 km per second). Well,...
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1answer
9k views

Escape velocity for our galaxy

What should be the escape velocity for our galaxy and can we calculate it? For instance, if we assume that we don't know the mass of our galaxy, you may consider it as small 'm'.
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1answer
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Belt of matter at ~14 AU?

In this terrific answer user Hobbes presents a graph of escape velocity as a function of distance from the Sun: I notice that at about 14 AU the graph goes from decreasing exponentially to ...
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3answers
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Why not travel to Mars in 2 months?

Just to clarify... I've made some research and generally know what the case is, didn't mean to make the question sound stupid... :) I know there is a thing called Hohmann transfer orbit, named after ...
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6answers
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Could a Human reach escape velocity by jumping from the surface of Ceres (a dwarf planet)?

According to this answer the surface gravity of Ceres is estimated to be only $0.27 m/s^2$. With a rotation period of 9 hours. The gravity seems light enough to overcome by leg muscle alone, and if ...