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関連する概念動画

Gravity between Spherical Bodies01:27

Gravity between Spherical Bodies

Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is always directed...
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...
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...
Transition Zone01:28

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
Geoid and Ellipsoid01:28

Geoid and Ellipsoid

The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...

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関連する実験動画

Updated: Jul 18, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

ネオプロテロゾーイク期の雪球地球である.

Hoffman1, Kaufman, Halverson

  • 1P. F. Hoffman, G. P. Halverson, D. P. Schrag, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. A. J. Kaufman, Department of Geology, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)
|August 28, 1998
PubMed
まとめ

ネオプロテロゾイク期の雪球地球イベントは,海洋の生産性の長期的崩壊を引き起こしました. 急激な火山の温暖化は,極端な温室効果条件とキャップ炭酸塩の世界的な降水をもたらしました.

科学分野:

  • 地質化学 地質化学
  • 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
  • 堆積物学 堆積物学 堆積物学 堆積物学 堆積物学

背景:

  • ネオプロテロゾーイク時代は,深刻な地球規模の氷河期を経験し,潜在的に"スノーボール地球"のイベントとなった.
  • これらの氷河堆積と関連した炭酸岩は,地球規模で負の炭素同位体異常を示しています.
  • 極端な気候変動に対する海洋の反応を理解することは極めて重要です.

研究 の 目的:

  • ネオプロテロゾイク期の炭酸岩における負の炭素同位体異常の原因を調査する.
  • 地球規模の氷河期およびその後の海洋の生物学的生産性を再構築する.
  • 世界的にキャップ炭酸岩の形成を説明してください.

主な方法:

  • ナミビアの炭酸岩における炭素同位体異常の分析.
  • 熱沈没の歴史の推定. 熱沈没の歴史の推定. 熱沈没の歴史の推定.
  • 大気中の二酸化炭素レベルと海洋学的変化のモデリング.

主要な成果:

  • 証拠は,表面の海洋生物の生産性が数百万年にわたって崩壊したことを示唆しています.

さらに関連する動画

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 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

関連する実験動画

Last Updated: Jul 18, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 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

  • この崩壊は,地球規模の氷河化 (スノーボール地球) と関連している.
  • 火山からの放出ガスによる氷河期の突然の終結は,極端な温室効果条件をもたらした.

    • 結論:

    • 火山による二酸化炭素の放出は,急速な雪球地球終結と極端な温暖化を引き起こした.
    • 大気中のCO2が海洋に流出すると,カルシウム炭酸の降雨が広範囲に広がった.
    • このプロセスは,キャップカーボネート岩の地球規模の形成を説明します.