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Related Concept Videos

Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
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Acceleration due to Gravity on Other Planets

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Kepler's Third Law of Planetary Motion

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Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
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The source of Saturn's G ring.

Matthew M Hedman1, Joseph A Burns, Matthew S Tiscareno

  • 1Department of Astronomy, Cornell University, Ithaca, NY 14853, USA. mmhedman@astro.cornell.edu

Science (New York, N.Y.)
|August 4, 2007
PubMed
Summary

Saturn's G ring likely originates from a debris arc trapped in resonance with the moon Mimas. This arc contains both dust and larger bodies, suggesting a unique origin for the ring system.

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Area of Science:

  • Planetary Science
  • Astronomy
  • Ring Dynamics

Background:

  • The origin of Saturn's narrow G ring has remained an unresolved question in planetary science.
  • Previous observations primarily identified small dust grains within the G ring.

Purpose of the Study:

  • To investigate the source and composition of Saturn's G ring.
  • To explain the presence of a bright, localized arc within the G ring.

Main Methods:

  • Analysis of data from the Cassini spacecraft, including camera observations and energetic particle flux measurements.
  • Orbital dynamics calculations to identify resonant interactions between ring material and Saturnian moons.

Main Results:

  • A bright arc was identified within the G ring, located approximately 167,496 km from Saturn's center.
  • This arc is trapped in a 7:6 corotation eccentricity resonance with the moon Mimas.
  • Observations suggest the arc comprises both small dust particles and larger, centimeter- to meter-sized bodies, implying a substantial total mass.

Conclusions:

  • The G ring's origin is likely linked to this debris arc, potentially formed from the erosion of larger bodies.
  • Collisions involving these larger bodies may continuously replenish the G ring with dust.
  • The resonance with Mimas is crucial for maintaining the stability and structure of this arc and, consequently, the G ring.