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Gravity between Spherical Bodies

Gravity between Spherical Bodies

Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
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Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

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Mars gravity: high-resolution results from viking orbiter 2.

Science (New York, N.Y.)

|March 9, 1979

Summary

Detailed Martian gravity mapping reveals significant anomalies, including a large one near Olympus Mons. This research provides new insights into Mars

Area of Science:

Planetary Science
Geophysics

Background:

Understanding Mars' gravity field is crucial for deciphering its geological history and internal structure.
Previous gravity maps had limited resolution and spatial coverage.

Purpose of the Study:

To create a high-resolution gravity map of Mars.
To identify and characterize gravitational anomalies and their correlation with geological features.

Main Methods:

Utilized Doppler radio-tracking data from spacecraft.
Generated a gravity map covering 30°S to 65°N latitude and 360° longitude.
Achieved a feature resolution of approximately 500 kilometers.

Main Results:

Revealed a significant gravity anomaly associated with Olympus Mons.

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Scattering And Absorption of Light in Planetary Regoliths

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Identified a mascon (mass concentration) in Isidis Planitia.

Correlated other anomalies with known volcanic structures.

Conclusions:

The new gravity map provides unprecedented detail of Martian gravitational variations.
The identified anomalies, particularly near Olympus Mons, offer insights into the planet's crustal and mantle processes.
The modeling of Olympus Mons suggests a substantial subsurface mass concentration.