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関連する概念動画

Kepler's First Law of Planetary Motion01:10

Kepler's First 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. 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,...
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...
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...
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

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...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

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 velocity with the...
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...

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関連する実験動画

Updated: Jun 28, 2026

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

恒星 HR 879999 を周回する複数の惑星の直接画像.

Christian Marois1, Bruce Macintosh, Travis Barman

  • 1National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada. christian.marois@nrc-cnrc.gc.ca

Science (New York, N.Y.)
|November 15, 2008
PubMed
まとめ

エクソプラネットを直接画像化することは困難ですが,木星のような惑星を明らかにします. HR8799系を観測したところ,木星の5~13倍の質量を持つ3つの惑星が観測されている.

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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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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

Published on: July 30, 2020

関連する実験動画

Last Updated: Jun 28, 2026

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

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

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科学分野:

  • 天文学と天体物理学について
  • 外惑星科学とは,外惑星科学のこと.
  • 直接イメージング技術は,直接イメージング技術です.

背景:

  • エクソプラネットの直接画像は,大気の特徴と地球のような惑星の発見に不可欠です.
  • 課題には,小さな角度分離と,惑星と星の間の高輝度コントラストが含まれます.

研究 の 目的:

  • 外惑星の検出と特徴づけのための直接画像の能力を実証する.
  • 高コントラスト画像のベンチマークであるHR 8799システムを分析する.

主な方法:

  • ケック望遠鏡とジェミニ望遠鏡からの高コントラスト画像観測を利用した.
  • 軌道運動を追跡するために,マルチエポックデータを分析した.

主要な成果:

  • 星 HR 8799 を周回する3つの惑星を,24,38,68の天文単位で予測された距離で撮影しました.
  • 観測された3つの惑星の反時計回りの軌道運動.
  • 推定惑星質量は,光度とシステムの年齢に基づいて,木星質量5〜13の惑星質量である.

結論:

  • HR 8799システムは,スケールアップされた外部太陽系アーキテクチャのための優れたアナログとして機能します.
  • 直接イメージングは,広い軌道にあるガス巨星を研究するための有効な方法です.
  • この技術により,系外惑星の大気のさらなる特徴づけが可能になります.