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関連する概念動画

Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
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Circular Orbits and Critical Velocity for Satellites01:16

Circular Orbits and Critical Velocity for Satellites

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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...
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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

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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.
On the other hand,...
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Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

4.7K
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...
4.7K
Kepler's Third Law of Planetary Motion01:18

Kepler's Third Law of Planetary Motion

3.6K
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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Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

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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.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
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Bringing the Visible Universe into Focus with Robo-AO
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Bringing the Visible Universe into Focus with Robo-AO

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ケプラー20号を周回している地球サイズの2つの惑星.

Francois Fressin1, Guillermo Torres, Jason F Rowe

  • 1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA. ffressin@cfa.harvard.edu

Nature
|December 22, 2011
PubMed
まとめ
この要約は機械生成です。

天文学者は,地球サイズの1つ,地球より小さい2つの新しい系外惑星を発見し,ケプラー20号の恒星の周りを回っている. これらの岩石惑星は,太陽系外での地球の類型を探求する上で重要な進歩を表しています.

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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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関連する実験動画

Last Updated: Apr 30, 2026

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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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科学分野:

  • 天文学と天体物理学について
  • エクソプラネット科学 エクソプラネット科学

背景:

  • 観測能力は,地球上の類似物体の探求を進めてきました.
  • エクソプラネットの大きさは,通過フォトメトリによって決定され,星光の減少を測定します.
  • これまで発見された最も小さな系外惑星の半径は地球の1.42倍です.

研究 の 目的:

  • 恒星ケプラー20を周回する2つの新しい系外惑星の発見を報告する.
  • これらの新発見の系外惑星の大きさを特徴づけるために.
  • 観測された通過信号の惑星的性質を統計的に検証するために.

主な方法:

  • エクソプラネットを検出するためのトランジットフォトメトリ.
  • 惑星の信号を,日蝕する二重星から区別するための統計分析.
  • 惑星の組成と大気を推論するための理論モデリング.

主要な成果:

  • ケプラー20の周りの2つの系外惑星の発見:一つは地球サイズ (1.03 R()) で,もう一つは地球より小さい (0.87 R()).
  • 統計分析は,惑星の解釈を高い信頼度 (>3桁の大きさ) で確認しています.
  • 新しい惑星が恒星に及ぼす重力の影響は,現在の測定能力を下回っている.

結論:

  • 発見された系外惑星は岩石で,鉄とシリケートでできている可能性が高い.
  • 外部系外惑星は,かなりの水蒸気大気を有している可能性があります.
  • これらの発見は,潜在的に居住可能な地球のような系外惑星の探求を進めています.