Questions tagged [escape-velocity]

Questions about the speed at which an object can go to a point at infinity while ending at rest.

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7 votes
3 answers
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escape velocity of leaving the Milky Way galaxy vertically and horizontally

Is there a difference in the escape velocity when leaving the Milky Way galaxy vertically (out of galactic plane) horizontally (in the galactic plane)?
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0 votes
0 answers
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escape velocity of the Milky Way galaxy [duplicate]

I have heard of the escape velocity of Earth to be 11 km/s. Is there an escape velocity of the Milky Way galaxy? If yes, what number is it and how can it be computed? Is there a difference in leaving ...
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1 vote
1 answer
181 views

What is the maximum speed in which a human jumping away from Deimos and towards Mars would actually fall back down rather than enter Mars' gravity?

Imagine a universe in which Deimos and a human are the only objects in the universe. It doesn't matter if the human jumped even 1 nanometer per second slower than escape velocity, they would still ...
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20 votes
3 answers
5k views

Can an object from a natural process escape earth gravitation?

I'm no expert, but I once studied basic from advanced physics and understand gravity action/reaction escape velocity of 11.2 km/s from the earth surface escape velocity changing as the object go far ...
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3 votes
1 answer
163 views

Can Stellar Spaghetti ever escape?

Spaghettification is the deformation of a body into long, thin strips due to tidal forces as the body passes through a powerful gravitational field. Image from wikipedia: Stellar spaghetti has been ...
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4 votes
3 answers
193 views

What escape velocity would quark stars have?

Quark stars are hypothetical compact stars that are denser than neutron stars and maybe the last stage of upholding matter before stars that collapse into a singularity. Neutron stars have escape ...
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6 votes
1 answer
555 views

Can a habitable planet be smaller than 0.58 Earth radii?

According to the below image, the lowest escape velocity a planet can have in order to still be able to retain water on its surface and have a temperature above freezing is 6.5 km/s minimum. With ...
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3 votes
2 answers
205 views

What should the mass of a planet be in-order for its escape velocity to be near the speed of light? [duplicate]

What should the mass of a planet be in-order for its escape velocity to be the speed of light? Is it even possible? What will it look like from an outside viewer? Will it even be visible in the human ...
4 votes
1 answer
254 views

Do Enceladus' geysers fall back to its surface or do they achieve escape velocity?

Enceladus, a moon of Saturn, has a very low surface gravity at 0.114 m/s² or 0.012 g. It has a subsurface ocean of liquid water and is ejecting plumes of it. Does the ejected water eventually fall/...
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1 vote
2 answers
141 views

Largest body in the solar system that a baseball thrown by a professional pitcher could escape

What is the largest (most massive) known body in the solar system that a professional pitcher could throw a baseball off of, i.e. that has an escape velocity lower than ~102 MPH? (45.33 m/s)
0 votes
2 answers
206 views

Are exoplanets which are above escape velocity of particular interest?

I was perusing the exoplanet database and looking for some of the more extreme orbits, when I happened upon HD 20782 B: http://exoplanets.org/detail/HD_20782_b Which is also listed (in two sentences)...
0 votes
1 answer
112 views

Could an object, assuming possible, escape black hole by travelling above constant speed? [closed]

I am always hearing that after travelling inside a given BH's event horizon, the escape velocity is greater than c, which makes it impossible to escape. Suppose an ship is inside a BH. Assume it is ...
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5 votes
2 answers
559 views

Does matter accelerate to the speed of light as it approaches the singularity?

$$v_\mathrm e=\sqrt{\frac{2GM}r}$$ If we understand the escape velocity to be the speed needed to escape from the 'surface' of a gravitational object described by the above equation. It is equally ...
1 vote
3 answers
299 views

Black hole, escape velocity, going up?

I do know nothing can escape a black hole, and I understand popsci explanation of geodesics of space-time around and inside the event horizon. I however have some trouble with following thought ...
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5 votes
4 answers
4k views

What is the escape velocity of our Galaxy relative to?

I've been thinking that everything has a relative escape velocity, if it has Mass, seemingly. You can escape orbit around the earth by accelerating enough. You can escape the orbit of the sun by ...
2 votes
1 answer
299 views

Is the radius used in the formula for the escape velocity the average radius of the celestial object or the radius at the starting location?

I learnt that the escape velocity is given by $$v_e = \sqrt{\frac{2GM}{r}}$$ Say I want to launch a rocket from the earth into space and want to calculate the escape velocity $v_e$ (I guess without ...
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11 votes
2 answers
2k views

Can I leave a planet without achieving escape velocity?

I know that if you exceed orbital velocity, you will never fall-back to the planet. My question is not about orbits. It's about brute-force propulsion to achieve altitude. I'm using an ...
1 vote
2 answers
1k views

Can earth escape sun's gravity with the help of a black hole heading towards our solar system?

To escape the Sun's gravity, the Earth would need sufficient amount of energy. Let's say a stellar black hole has entered our solar system and at a certain distance from earth, the black hole exerts ...
0 votes
1 answer
351 views

How to get from the earth to another planet/ the moon? What happens on the way? [closed]

I have a problem explaining for my students how to get from the earth to the moon? Is there someone who can give a good explanation? I Think these are words that might be included. Escape velocity, ...
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1 vote
1 answer
234 views

Why are the high density regions in outer space black holes?

The escape velocity of an object is given by the following formula. $$v_e=\sqrt{\frac{2GM}{r}}=\sqrt{\frac{2 \mu}{r}}= \sqrt{2gr}$$ As far as I am aware, the mass of the star which formed the black ...
4 votes
3 answers
3k views

What happens if you fail to reach escape velocity for the galaxy?

I was listening to Skeptics Guide to the Universe the other day, and Steve Novella mentioned that the escape velocity for the galaxy is 544 km/s. If an object fails to reach escape velocity on Earth, ...
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