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関連する概念動画

The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Gravitational Potential Energy for Extended Objects01:07

Gravitational Potential Energy for Extended Objects

Consider a system comprising several point masses. The coordinates of the center of mass for this system can be expressed as the summation of the product of each mass and its position vector divided by the total mass:
Circular Orbits and Critical Velocity for Satellites01:16

Circular Orbits and Critical Velocity for Satellites

The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
Kepler's Third Law of Planetary Motion01:18

Kepler's Third Law of Planetary Motion

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...
Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

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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Updated: Jun 19, 2026

Tree Core Analysis with X-ray Computed Tomography
06:56

Tree Core Analysis with X-ray Computed Tomography

Published on: September 22, 2023

土星の最大のリングである.

Anne J Verbiscer1, Michael F Skrutskie, Douglas P Hamilton

  • 1Department of Astronomy, University of Virginia, Charlottesville, Virginia 22904-4325, USA. verbiscer@virginia.edu

Nature
|October 9, 2009
PubMed
まとめ
この要約は機械生成です。

土星には,これまでに発見されていない巨大なリングシステムが存在し,既知のリングをはるかに超えて,その衛星のフィービーと結びついています. この巨大な塵の輪は,フィービーへの衝突によって維持され,惑星から前例のない距離に達します.

さらに関連する動画

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

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Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
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Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast

Published on: February 20, 2017

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Last Updated: Jun 19, 2026

Tree Core Analysis with X-ray Computed Tomography
06:56

Tree Core Analysis with X-ray Computed Tomography

Published on: September 22, 2023

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
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科学分野:

  • 惑星科学は惑星科学である.
  • 天体物理学 天体物理学
  • 太陽系ダイナミクス 太陽系ダイナミクス

背景:

  • 惑星環は,通常,衛星形成を阻害する重力により,宿主惑星の近くに閉じ込められています.
  • 木星のゴッサマーリングや土星のEリングのような例外は,惑星半径5〜10まで広がる広い塵のシートです.
  • これらの既知の拡張リングは,源衛星からの塵によって継続的に供給されています.

研究 の 目的:

  • 土星の周りの広大な,これまで未知のリングシステムの発見と特徴を報告するために.
  • 月のフィーベに関連したこの広大なリング構造の起源とダイナミクスを調査する.

主な方法:

  • 観測データを分析して,新しいリングシステムの範囲を特定し,定義する.
  • 粒子の分布,軌道動力学,環の維持機構を理解するためのダイナミック・モデリング.

主要な成果:

  • 土星の周りの巨大なリングを発見し,土星の半径128から207まで広がった.
  • リングの垂直厚さ (40R(S)) は,フィーベの軌道垂直運動と相関しています.
  • リングの光学的な深さは低く,木星の最も薄いゴッサマーリングに匹敵するが,粒子の密度は低い.
  • リング粒子は,おそらくフィービーへの衝撃から発生し,内側に移動し,一部はイアペタスに到達します.

結論:

  • 土星は,外側の衛星のフィービーと関連付けられている例外的に大きなリングシステムを所有しています.
  • フィービーへの衝撃は,この広大なリングの材料の潜在的な源である.
  • リング粒子は,惑星間距離にまで及ぶ土星のシステムの動力学に役割を果たしています.