Questions tagged [gravity]

Questions regarding the attractive force present between two masses. If about research in artificial gravity (i.e. manmade substitutes for gravity), please use the artificial-gravity tag.

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Considering the relativity of time, how is time experienced in deep space? [closed]

To be more specific, if the relativity of time is governed by the mass and gravity of objects (I.E the satellites orbiting earth experience minor time dilation compared to us on the ground), how is it ...
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Is it possible to jump down a 10 meter building on Moon and be perfectly fine? [duplicate]

I was told that if you theoretically jump down from a three-floor building (assume 10 m) on the Moon surface, you will equally break your bones as in if you were doing that on Earth. I do not know why ...
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How can a body experience weightlessness or micro gravity on the ground? [closed]

I was thinking how to have a situation on Earth of feeling weightlessness for an indefinite time, not for a few minutes like on a diving plane Not reduced gravity, weightlessness as I feel in a ...
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Accelerometer in space

If my understanding of the General Theory of Relativity is correct, according to the Equivalence Principle, forces due to gravity and acceleration are indistinguishable. If that's the case, then an ...
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Is there a term for the distance from an object at which it's gravitational pull is negligible?

I used to think that there was a point at which you escaped the Earth's gravitational pull. This is technically false, since every object in the universe is attracted towards every other object. Is ...
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How fast could a person run on the Moon?

Measures of the vertical and horizontal vectors of athletes running shows that once they get up to speed the ratio of vertical to horizontal exertion is about 4:1. This paper by Jean-Benoit Morin Ph.D....
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How deep is the force well of L4 and L5 Lagrangian Points of Earth-Sun set?

The Lagrangian Points are points in space, where the combination of gravitational pull of a set of two bodies and the centripetal force of orbiting one of them add up to zero. The special property of $...
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Sensitivity of Space Telescopes and Instruments

I have been doing a bit of light reading on space telescopes and have been amazed by the reported sensitivity of some of the instruments. In particular, the Laser Interferometer Space Antenna (LISA) ...
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Could weights make walking on the Moon feel like walking on Earth?

The Moon has about 1/6th of Earth's gravity, which (it is said) would perhaps lead to muscle degeneration for humans living there long-term. However, what if those humans wore bodysuits weighted to ...
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Is the velocity of orbiting around the earth exact?

Let's consider a satellite orbiting the earth. From the centripetal acceleration we have $v=\sqrt{g_{earth}r}$. If we know the $r$ and $g$, we can get $v$, which is the velocity needed to orbit around ...
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Adapting to Increased Gravity on Alien Planets

What would mankind use in order to adapt or merely cope with the effects of a large increase of gravity on an alien world? Assuming there are no other problems we would face.
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Why does lunar gravity decrease?

I was exploring some queries about the moon and came across the question Which artificial satellites in lunar orbit are currently active?. In this, the accepted answer says: The lunar gravity field ...
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Standing at the top of a space elevator would 'up' be towards the Earth?

If I rode a space elevator to the top, assuming only natural forces apply, would the Earth be over my head or under my feet? If it was over my head how is that possible?
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On a Super-Earth 1.5x the volume and mass of Earth, would our rocket technology allow us to reach orbit? [duplicate]

To try and make parameters clear, can we say we are talking about 50% 'more Earth'? As in, Earth, but 1.5 times as big and heavy? And let us include the atmosphere. If there is 50% more of it by ...
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How to simulate the environment of the moon for rovers on earth?

What technology or techniques are used to test rovers (that are designed to work on the moon, for example) on earth ? How can the environment (e.g. gravity) of the moon be simulated on earth?
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What would it look like to shatter a glass or break similar material in Zero Gravity?

I just had this thought today: I wonder what the shattering would look like if you "dropped" a glass or a ceramic cup in zero gravity. Obviously you can't drop it, you'd have to like throw it. But ...
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Gravity Assist - Orbiting Satellites & Speed Increases

So, a gravity assist in very simple terms is when an object uses a planet's gravity and rotating momentum to increase the objects speed. If this is true, why doesn't the ISS get further and further ...
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Is there a profile of atmospheric pressure and gravity of Uranus?

One of the intriguing facts about Uranus is that somewhere within the gravity is about 0.9g. Now, if one wants to daydream about living on Uranus in slightly chilly balloons, it would be interesting ...
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What work is being done to develop and test artificial gravity?

There are many ways to produce artificial gravitational effects, such as a rotating spacecraft, linear acceleration, or harnessing magnetism. Possibly there are other ways to produce gravity that have ...
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Could increased atmospheric pressure act as a countermeasure for effects of microgravity?

Are there any possibilities to counter the negative effects of low or micro gravity by increasing the atmospheric pressure?
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Are Delta-V requirements for leaving the surface of a planet proportional to gravity?

I am trying to gain some intuition about Delta-V requirements. My understanding is if the Delta-V budget was doubled, the difficulty of the mission is more than double because of the exponential ...
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Where is the gravity generated on a spaceship in super fast space travel?

After reading the question: Is artificial gravity feasible in manned long-term space exploration?, I am having a hard time imagining what experiencing the "continuous acceleration" method of gravity ...
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Why do malfunctioning satellites come back to Earth?

In school, I learned that if a satellite moves at a speed $\sqrt{gR}$ (the square root of the product of the acceleration due to gravity and radius of the Earth), then it will remain in Earth's orbit. ...
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How do I calculate lowest possible mission delta V from Escape velocities?

The gravitational potential of an object around the sun, relative to some point far far away (from the sun), should be smaller zero and proportional to $V_{escape}^2$. Hence the speed one needs should ...
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How does the gravity of a massive non-spherical object act on things around it?

Firstly, not sure if this question ought to be in the physics SE site. Please let me know if it should. Secondly, I don't know a whole lot about physics (I'm just inquisitive). So please try to keep ...
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Will any near future lunar missions use GRAIL data?

Lunar missions are known to be the subject to the exceptionally disuniform gravity. GRAIL generated a very high resolution gravity map of Luna. Will any missions to Luna in the near future (say, ...
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Is there a table of the gravitational pull of a spacecraft? [duplicate]

I would like to put a spin on What is the maximum mass of a satellite that can be placed in GEO? Gravity is a function of the mass of both (all) bodies, and their relative separation. Wikipedia lists ...
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Does a gravity assist increase the g force on the ship?

In my mind, I picture a gravity assist sling shot boost like a ball on the end of string being swung until the centrifugal force grows strong and then is released. Where gravity is the string, the ...
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Does living in space affect humans' strength?

I am an enthusiast of space exploration. Is it possible that strength of a human can be increased or decreased by keeping them in microgravity? From this link. Astronauts can become as weak as 80-...

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