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関連する概念動画

Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a change...
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,...
Tidal Forces01:06

Tidal Forces

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 black holes.
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...
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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 per...

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関連する実験動画

Updated: Jun 24, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
07:18

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

太陽が縮んでいるのか?

I I Shapiro

    Science (New York, N.Y.)
    |April 4, 1980
    PubMed
    まとめ
    この要約は機械生成です。

    1736年から1973年までの23回の水星の通過を分析したところ,太陽の直径の大きな変化は見られなかった. 地球上の角度直径の減少は, 1 世紀あたり 0.3 弧秒未満であり,以前の発見と矛盾しています.

    さらに関連する動画

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
    09:00

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

    Published on: October 27, 2017

    CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
    07:08

    CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

    Published on: June 12, 2019

    関連する実験動画

    Last Updated: Jun 24, 2026

    Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
    07:18

    Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

    Published on: October 18, 2017

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
    09:00

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

    Published on: October 27, 2017

    CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
    07:08

    CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

    Published on: June 12, 2019

    科学分野:

    • 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
    • ソーラー物理学 ソーラー物理学
    • 歴史的観測 歴史的観測

    背景:

    • 太陽光直径の直接測定は矛盾する結果をもたらしています.
    • 歴史的通過観測は,太陽の変動性を評価するための代替方法を提供します.

    研究 の 目的:

    • 歴史的な水星通過データを用いて太陽の直径の長期的な変化を調査する.
    • 直接的な太陽観測に基づいた以前の研究と結果を比較する.

    主な方法:

    • 1736年から1973年の間に記録された23回の水星通過の分析.
    • 地球から観測される太陽の角直径の変化率を決定するための回帰分析.

    主要な成果:

    • 太陽の直径の統計的に有意な変化は検出されなかった.
    • 世紀ごとに0.3弧秒未満の角直径の減少が計算されました (90%信頼限度).
    • この結果は,エディの1世紀あたり2弧秒の減少という発見と矛盾している.

    結論:

    • 歴史的な水星通過データは,観測期間中に太陽の直径が安定していることを示唆しています.
    • この発見は,直接的な測定に基づいた太陽直径の著しい収縮に関する以前の主張に異議を唱えるものである.