関連する実験動画
Updated: May 4, 2026

10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
21.4K
冥王星の大気の大規模な変化は,最近の恒星隠蔽によって明らかになりました
B Sicardy1, T Widemann, E Lellouch
1Observatoire de Paris, LESIA, 92195 Meudon, France. bruno.sicardy@obspm.fr
Nature
|July 11, 2003
まとめ
冥王星は冥王星である.
科学分野:
- 惑星科学は惑星科学である.
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 大気科学 大気科学
背景:
- 冥王星の微妙な窒素大気は,珍しい観測機会のため,ほとんど理解されていません.
- 以前の研究では,1985年と1988年の恒星隠蔽事件を根拠にしていた.
- まだ冥王星を訪れた宇宙船はなく,その場所での大気分析が行われている.
研究 の 目的:
- 冥王星の大気圧の変化を1988年以来調査する.
- 冥王星を含む最近の恒星隠蔽イベントのデータを分析するために.
- 冥王星の大気中の季節的変動の可能性を調査するためです.
主な方法:
- 1988年以降の14年間に発生した恒星隠蔽イベントのデータを利用しています.
- 冥王星の後ろを通過する星の光の曲線の印を分析する.
- 新しい隠蔽データと過去の観測データを比較する.
主要な成果:
- 冥王星の大気圧の有意な上昇が観察されました.
- 大気圧は14年間で2倍になったようです.
- 証拠によると,大気密度に影響を与える季節的な影響が考えられます.
結論:
- 冥王星の大気は,比較的短い期間で圧力の大幅な変化を経験しています.
- 観測された変化は,動的な大気プロセス,おそらく季節的であることを示している.
- 冥王星の大気の進化を理解するために,さらなる観測が不可欠です.
関連する概念動画
Global Climate Change
24.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.4K
Tidal Forces
2.9K
The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
2.9K
Schwarzschild Radius and Event Horizon
2.2K
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...
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...
2.2K
Detection of Black Holes
1.7K
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...
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...
1.7K
Radiation Pressure: Problem Solving
1.0K
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
1.0K
Variation of Atmospheric Pressure
3.6K
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
3.6K

