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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

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...
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...
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...
Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

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Updated: Jun 18, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

世界で最も暑い惑星.

Joseph Harrington1, Statia Luszcz, Sara Seager

  • 1Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA. jharring@physics.ucf.edu

Nature
|May 15, 2007
PubMed
まとめ
この要約は機械生成です。

最小の通過系外惑星であるHD 149026bから直接検出された熱放射は,驚くほど高い温度を示しています. この発見は,標準的な系外惑星の大気モデルに異議を唱え,ユニークな熱特性を示唆しています.

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Scattering And Absorption of Light in Planetary Regoliths
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Scattering And Absorption of Light in Planetary Regoliths

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

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関連する実験動画

Last Updated: Jun 18, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

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

科学分野:

  • 惑星外科学とは,惑星外科学です.
  • 天体物理学 天体物理学
  • 惑星の大気圏

背景:

  • 200以上の太陽系外惑星が知られていますが,トランジットの幾何学を示すのは14個だけです.
  • トランジットの系外惑星は,惑星の性質の直接的な測定を可能にします.
  • 以前の太陽系外惑星の熱放出に関する研究は,約0.3.3のボンドアルベドを想定した予測と一致している.

研究 の 目的:

  • 最小の既知のトランジット系外惑星であるHD 149026bからの熱放射の直接検出を報告します.
  • HD 149026b.の熱特性と大気特性を調査する.
  • 観測された熱放出を理論モデルと比較する.

主な方法:

  • エクソプラネットHD 149026bからの熱放出の直接検出 8マイクロメートル.
  • 明るさの温度を測定する.
  • 観測データをブラックボディの放射モデルと異なるアルベドシナリオと比較.

主要な成果:

  • HD 149026b.からの熱放出の直接検出
  • 測定した明るさの温度は8マイクロメートルで2,300 ± 200Kでした.
  • 観測された気温は,ゼロ以外のアルベドを持つ標準モデルによって予測されたより大幅に高い.

結論:

  • ゼロ以外のアルベドを持つ標準的な均一ブラックボディモデルは,観測されたデータと矛盾しています.
  • 高温は,非常に低いアルベド,強い8マイクロメートルの放射,時間的な変動,または代替的な熱源を暗示する可能性があります.
  • 瞬時の再放出ブラックボディモデルはデータと一致し,重元素の濃縮による可能性のある新しい大気特性を示唆しています.