Gravity has been Mapped

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In summary: GRACE, which shows variations in gravity all over the world. The map, available on space.com, displays regions with lower than normal gravity in blue and those with higher than average gravity in red. Blakley also asked about the high gravity in the oceanic region to the left of England, to which it was suggested that it may be due to a higher density of heavy metals in or under the crust. The conversation also touched upon symmetrical antipodes around Australia and India and the definition of a (mGal) unit for newbies. In summary, the conversation revolved around the gravity map and its implications, with some additional discussions on the concept of gravity and its measurement units.
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  • #2
Why is gravity so strong in the oceanic region just to the left of England?
 
  • #3
presumably because there's a higher density there - perhaps due to a large quantity of heavy metals.
 
  • #4
Do you mean heavy metal in the ocean or being released in hydrothermal vents?
 
  • #5
Probably in or under the crust.
 
  • #6
it appears that the highs and lows in the USA and the Atlantic have some vague symmetrical antipodes around Australia and India
 
  • #7
the question is what the average?
and by gravity do the they mean gravity field, also known as g (the free fall acceleration)?

besides these queries, nice pic, nice colours...
 
  • #8
The new rationale:

"I'm not overweight, I just live in a high-gravity area."
 
  • #9
What is a (mGal) Unit, For newbies.

The gal or galileo is the CGS unit of acceleration. It is defined as 1 centimetre per second squared. The symbol for the gal is Gal.

In SI units: 1 Gal = 0.01 m/s².

The acceleration due to gravity at the Earth's surface is 976 to 983 Gal; the variation is mainly with latitude and elevation.

Variations in gravitational acceleration due to mountains or masses of lesser density within the Earth's crust, are typically tens to hundreds of milligals (mGal).

The gal is named after Galileo Galilei, a physicist who made the first measurements of the acceleration due to gravity

Gerald L. Blakley
 

1. What is "Gravity has been Mapped"?

"Gravity has been Mapped" refers to the process of creating a map that shows the variations in the strength of gravity across a specific area or region. This map helps scientists better understand the distribution of mass and the gravitational pull of different objects in that particular area.

2. How is gravity mapped?

Gravity is mapped through a process called gravity mapping, which involves collecting precise measurements of gravity using specialized instruments such as gravimeters and accelerometers. These measurements are then used to create a visual representation of the variations in gravity across a particular area.

3. Why is mapping gravity important?

Mapping gravity is important because it helps scientists gain a better understanding of the structure and composition of the Earth's surface and the objects that exist on it. It also provides valuable information for various applications such as mineral exploration, geophysics, and navigation.

4. What are the benefits of mapping gravity?

The benefits of mapping gravity include a better understanding of the Earth's geology and potential natural hazards, improved accuracy in satellite navigation systems, and the ability to identify potential areas for natural resource exploration.

5. Can gravity mapping be done on other planets?

Yes, gravity mapping can be done on other planets and celestial bodies. In fact, it has been successfully used to map the gravity of the Moon, Mars, and other planets in our solar system. This helps scientists understand the composition and structure of these objects and aids in space exploration missions.

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