Questions tagged [gravity]

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4
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0answers
63 views

How do you choose appropriate parameters for a lowpass filter when filtering a Bouguer anomaly?

I am trying to filter my Bouguer anomaly data to remove the short wavelength features. I have created a lowpass filter to achieve this, but I am wondering how I can more objectively choose my cutoff ...
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0answers
90 views

How can I make a Python function return the Moon's gravitational force in a form I can use to calculate orbits?

The Space SE question How much does it cost to land on a lunar mascon? includes the background information below. I am sure it's not too hard to find a link where spherical harmonic coefficients for ...
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1answer
68 views

Why isn't the acceleration of an object in Earth's gravity related to the object's mass? [closed]

Why isn't the acceleration of an object in Earth's gravity related to the object's mass? Please, try to explain this effect without physical formulas, but using only logical formulation.
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3answers
5k views

Are we experiencing lower level of gravity now compared to past?

Whole civilizations have been buried underground and we have built new landscapes over them. The fact that tall buildings and houses are being excavated from under the ground means that we are living ...
11
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1answer
2k views

What is the fastest the Earth has ever spun?

How fast can the Earth rotate and support life? In prehistoric times, dinosaurs were so massive that archeologists wonder how they were not crushed under their own weight. Could a faster spinning ...
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1answer
69 views

If the earth's core is made up of copper/other metals other than iron-nickel alloy, how our magnetosphere will be?

We know that our earth's core is made up of iron-nickel alloy and it is spinning to create magnetic flux all around our planet to create our life-saving Magnetosphere. And this also influences our 9.8 ...
0
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1answer
69 views

How was the Earth's core made?

All I've heard until now is that when the Earth was very hot and slimy, the relatively heavier elements went down to the center of the Earth to form the core. But lately I've come up a contradiction ...
12
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4answers
3k views

Hudson Bay Has Low Gravity?

Is there lower gravity at the Hudson Bay? How does this happen? And where exactly is this because I might want to go.
3
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1answer
230 views

A balloon falling from space?

How long would it take for a store bought rubber balloon filled in space with air to fall from space just outside the atmosphere and touch ground? Would it Pop? Added after comments: Ideally you ...
4
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1answer
60 views

Realtime planetary gravity maps?

I'm trying to find maps of realtime (or at least periodically updated / semi-realtime) gravity maps of Earth. I was hoping that GOCE might have something like this available, but I've been hitting a ...
5
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1answer
80 views

How much energy does the Moon transfer to the Earth, does this affect the Earth's surface temperature?

I'm wondering by how much the gravitation effects, tides etc caused by the moon (and other energy such as moonlight IR) increase the surface temperature of the Earth. So how much warmer than the ...
2
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2answers
127 views

Why doesn't Wolfram Alpha show low gravitational acceleration for the Hudson Bay?

I thought I would be clever and add a new answer to Hudson Bay Has Low Gravity? by using Wolfram Alpha to report gravitational acceleration for different locations, but it looks like my cleverness ...
7
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1answer
73 views

Can anyone explain the torque that causes the Earth's axial precession?

Looking around on the web, I frequently see explanations like "precession is caused by the action of the Sun's gravity on the Earth's equatorial bulge." That's nice, but I'm interested in a little ...
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2answers
106 views

Variations in Gravity over Time

Is there any consensus about the conjecture that gravitational force on Earth may have changed significantly over geological time; and in particular in periodic increase associated with mass ...
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0answers
35 views

Detailed gravity maps

Does anyone know if it is possible to get a gravity map of a specific region of Greenland? The data I've found here http://icgem.gfz-potsdam.de/vis3d/longtime , are simply of to low spatial ...
5
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2answers
386 views

Plate Tectonics vs Gravity for Creating Highs and Lows

I have a question that I thought of when discussing a Worldbuilding scenario here. In that question, a super earth with gravity 1.35 times that of earth's is discussed, and is assumed to have shallow ...
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1answer
275 views

If Earth had rings would gravity exerted by Earth decrease?

If Earth had enough mass in its own rings, more than the weight of Earth: What could it decrease the gravity to? Would the atmosphere have more depth or be thinner? What would the weather be like? ...
4
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1answer
470 views

How high is too high for hydrogen to rise?

If hydrogen is the lightest gas known, would it rise making the outermost part of the atmosphere mostly hydrogen? Images to associate with your answer would be much appreciated. Thanks
9
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2answers
697 views

Terrain correction for gravity data using Nagy, 1973

I am working with an algorithm for terrain correction of gravity data. I am using Nagy, 1973. However, I could not get the results I need. So, this is the problem. I have this function where x,y,z ...
4
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0answers
77 views

What would be the depth variation of a “water ellipsoid” above a reference ellipsoid Earth?

The question If the Earth was a smooth spheroid how deep would be the ocean? has an excellent answer which explains the shape and surface area of an oblate spheroid before calculating the average ...
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0answers
63 views

Are ramp pumps the solution to the global water problem? [closed]

For the past few years people have been trying to solve the global water problem (especially in Africa), and what better way than being echo friendly. So my question is, can you use the tidal energy ...
3
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1answer
1k views

What does the degree and order of Spherical Harmonics mean?

I've been reading up about Gravitational Models and Spherical Harmonics. Where I first read about them is in this scholarly article on Autonomous navigation with Gravity Gradients. It talks about ...
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1answer
1k views

How much do tides affect earth's rotational velocity?

Many of us are familiar with an exaggerated picture of the Moon's effect on Earth's tides: Since the Earth is not uniformly covered with water, however, I imagine that the tidal effect will depend on ...
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0answers
40 views

Phase of S2 constituent in tidal prediction

I ran the ETERNA code for the prediction of tidal gravity at some station. Then I use Fourier analysis to recover the amplitude and phase of the S2 constituent. As I understand, the phase of the S2 ...
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1answer
2k views

Compute direction of gravity vector

As I understand to compute vector of gravity not saficient to compute normal to elipsoid, but we need to computer normal to geoid (by definition geoid is a surface to which the force of gravity is ...
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4answers
6k views

Does gravity differ from place to place on Earth

Does a particular object have the same weight on every part of Earth or does it vary?
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2answers
321 views

Change in earth mass since the time of the dinosaurs

Is there a significant difference in the mass of the Earth between now and the time of the dinosaurs (250 - 75 million years ago)? I was just wondering if the force of gravity on dinosaurs would have ...