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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

4.0K
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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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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Kepler's Third Law of Planetary Motion01:18

Kepler's Third Law of Planetary Motion

3.3K
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...
3.3K
Detection of Black Holes01:10

Detection of Black Holes

2.2K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
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Kepler's Second Law of Planetary Motion01:29

Kepler's Second Law of Planetary Motion

4.2K
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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Reduced Mass Coordinates: Isolated Two-body Problem01:12

Reduced Mass Coordinates: Isolated Two-body Problem

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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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関連する実験動画

Updated: Jun 21, 2025

Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans
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Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans

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外惑星WASP-39 bの不均質なターミネーター

Néstor Espinoza1,2, Maria E Steinrueck3,4, James Kirk5

  • 1Space Telescope Science Institute, Baltimore, MD, USA. nespinoza@stsci.edu.

Nature
|July 15, 2024
PubMed
まとめ
この要約は機械生成です。

天文学者はジェイムズ・ウェブ宇宙望遠鏡を使用して,外惑星WASP-39 bの明朝と夕方の異なる伝送スペクトルを捉えました. これは惑星の大気が均一でないことを示し 夕方側が朝の側よりも 熱く澄んでいるのです

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Isotropic Light-Sheet Microscopy and Automated Cell Lineage Analyses to Catalogue Caenorhabditis elegans Embryogenesis with Subcellular Resolution
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Isotropic Light-Sheet Microscopy and Automated Cell Lineage Analyses to Catalogue Caenorhabditis elegans Embryogenesis with Subcellular Resolution

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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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関連する実験動画

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Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans
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Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans

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Isotropic Light-Sheet Microscopy and Automated Cell Lineage Analyses to Catalogue Caenorhabditis elegans Embryogenesis with Subcellular Resolution
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Isotropic Light-Sheet Microscopy and Automated Cell Lineage Analyses to Catalogue Caenorhabditis elegans Embryogenesis with Subcellular Resolution

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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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科学分野:

  • 外惑星科学
  • 大気物理学
  • スペクトロスコーピー

背景:

  • 伝送光譜は系外惑星の大気を研究するための重要な技術です
  • 一般的な仮定は,特にターミネーター領域における大気の均質性です.
  • 以前の研究では 熱いガスの巨人の大気の不均一性が示唆されていましたが 直接的なスペクトル証拠は欠けていました

研究 の 目的:

  • 外惑星WASP-39bの 大気の不均一性を調査する
  • WASP-39 bの午前と夕方の伝播スペクトルを取得し,比較する.
  • 外惑星の大気中の均質な終末領域の仮定をテストする.

主な方法:

  • ジェームズ・ウェブ宇宙望遠鏡 (JWST) を利用して近赤外線観測.
  • 通過中にWASP-39bの高精度伝送スペクトルを取得する.
  • 軌道パラメータを分析し 朝と夕方のターミネーターのスペクトル特徴を比較する

主要な成果:

  • 朝と夕方の伝播スペクトルの間の有意な差異の検出
  • 夕方ターミネーターで観測されたより大きな通過深度 (405 ± 88 ppmより大きい).
  • 夕方のターミネーターは,太陽C/O比率で,朝のターミネーターより177K熱くなるとモデル化されています.

結論:

  • 外惑星WASP-39 bは不均質な大気を表しています
  • 夜のターミネーターはより熱く,より澄んで,朝のターミネーターよりも大きなスペクトル特徴を示します.
  • 一般的な循環モデルは,朝は曇り,夕方には晴れを示しています.