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Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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Radiation Pressure: Problem Solving01:09

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
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Kepler's First Law of Planetary Motion01:10

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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
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Kepler's Second Law of Planetary Motion01:29

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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
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Kepler's Third Law of Planetary Motion01:18

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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
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No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Updated: Oct 5, 2025

Scattering And Absorption of Light in Planetary Regoliths
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Cometary Dust.

Anny-Chantal Levasseur-Regourd1, Jessica Agarwal2, Hervé Cottin3

  • 1Sorbonne Université; UVSQ; CNRS/INSU; Campus Pierre et Marie Curie, BC 102, 4 place Jussieu, F-75005 Paris, France, Tel.: + 33 144274875, aclr@latmos.ipsl.fr.

Space Science Reviews
|January 31, 2022
PubMed
Summary
This summary is machine-generated.

Cometary dust studies reveal carbon-rich macromolecules and aggregates, thanks to the Rosetta mission. These findings enhance our understanding of solar system formation and evolution.

Keywords:
AggregatesComet formationCometsComets: coma, nucleus, trailComets: individual: 1P/Halley, 9P/Tempel 1, 67P/Churyumov-Gerasimenko, 81P/Wild 2, C/1995 O1 Hale-BoppCosmic dustDustJupiter-family cometsOrganicsOrigin of lifeRosettaSolar System formationSolar nebulaStardust

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Area of Science:

  • Planetary Science
  • Cosmochemistry
  • Astrobiology

Background:

  • Cometary dust research historically relied on remote sensing and limited sample return missions (e.g., Stardust).
  • Decades of study provided foundational knowledge on dust composition and properties.

Purpose of the Study:

  • To review the state of knowledge on cometary dust as of 2017.
  • To integrate data from diverse sources, particularly the Rosetta mission, to refine understanding of cometary dust.
  • To explore implications for solar system formation and evolution.

Main Methods:

  • Analysis of data from the Rosetta mission's comprehensive suite of instruments, including specialized dust detectors.
  • Integration of remote sensing observations from Earth and Earth orbit.
  • Inclusion of laboratory studies on returned cometary samples.
  • Consideration of theoretical and experimental simulations of dust properties and release mechanisms.

Main Results:

  • Identification of a significant abundance of carbon in macromolecular form within cometary dust.
  • Observation of aggregates across a broad spectrum of scales.
  • Rosetta mission provided unprecedented, high-resolution data on dust properties and release mechanisms.
  • Evidence suggests diverse dust release processes and particle properties.

Conclusions:

  • Cometary dust composition includes complex carbonaceous materials and aggregates.
  • The Rosetta mission significantly advanced our understanding of cometary dust dynamics and properties.
  • Further exploration is crucial for deciphering the formation and evolution of the Solar System through cometary studies.