関連する実験動画
Updated: May 11, 2026

06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
海洋マグマの固体化で2種類の地球型惑星の出現
Keiko Hamano1, Yutaka Abe, Hidenori Genda
1Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. keiko@eps.s.u-tokyo.ac.jp
Nature
|May 31, 2013
まとめ
地上の惑星は,溶けた状態からの固化によって2つのタイプに分かれます. タイプIの惑星は海のために水を保持し,タイプIIの惑星は長時間マグマの海と水力学的脱出のために水を失います.
科学分野:
- 惑星科学は惑星科学である.
- 地球科学 地球科学 地球科学
- 天体物理学 天体物理学
背景:
- 地球上の惑星の多様性を理解することは,惑星科学の鍵です.
- 地球に似た金星には水がないため,惑星の進化モデルのギャップが浮き彫りにされています.
- 系外惑星の大気を予測するには,惑星の進化に関する一般的な枠組みが必要です.
研究 の 目的:
- 固化過程に基づく惑星進化の枠組みを確立する.
- 地上の惑星を,その形成と進化に基づいて,異なるタイプに分類する.
- 金星をケーススタディとして用いて,惑星の水分量の分岐を説明する.
主な方法:
- 当初の熱い溶けた状態から惑星の固まりの分析.
- ホスト星からの距離や水分含有量などの要因を考慮した惑星進化のモデリング.
- 固化期間と水留量に基づいて,惑星をタイプIとタイプIIに分類する.
主要な成果:
- 地球型惑星は,タイプI (臨界距離を超えて形成される) とタイプII (臨界距離内に形成される) の2つの異なるタイプに固体化します.
- タイプIの惑星は急速に固体化し,水を保持して初期の海洋を形成します.
- タイプIIの惑星は,マグマの海洋が長期間存在し (最大1億年),水力ダイナミック・エスケープによる乾燥を引き起こし,これは金星の特徴と一致する.
結論:
- 惑星の進化の経路は,初期条件が類似した惑星でも著しく異なる.
- タイプI/タイプIIの分類は,陸上の惑星の水分分布を理解するための枠組みを提供します.
- 将来の観測では,若い恒星の周りの水豊富な惑星とマグマの海洋惑星の両方を検出する可能性があります.
さらに関連する動画
関連する概念動画
States of Water
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
The Colonization of Land
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
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...
Two Components: Liquid–Liquid Systems
A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...

