タグ

水星

18 件の記事

The Sun, the planets, their moons, and several trans-Neptunian objects

太陽系岩石惑星における水の分布と起源

太陽系岩石惑星D/H比
A telescopic view of Mars at full phase, featuring its prominent maria and south polar ice cap

アルベド特徴とは?惑星表面の明暗が明かす天文学の歴史

アルベド特徴惑星地質学火星水星
The evolution of the apparent diameter and phases of Venus

惑星の位相地球から見た惑星の満ち欠けの仕組み

惑星位相内惑星外惑星
The transit of Mercury on May 9, 2016. Mercury is visible to the lower left of center. A sun spot is visible above center.

水星の太陽面通過発生メカニズムと観測の科学

水星太陽面通過天文学惑星軌道
An angle ε is drawn between two straight lines from Earth to the Sun, and from Earth to the planet. This is demonstrated for different positions along circular orbits, both for planets closer to the Sun (where the angle is always less than 90°), and for outer planets (for which the angle can range from 0° to 180°), while distinguishing east and west sides.

離角(elongation)とは?天文学における惑星と太陽の角度的な距離を解説

離角最大離角内惑星外惑星
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惑星の分類内惑星と外惑星の違いとは

惑星内惑星外惑星地球
At left, tidally locked, the Moon rotates at the same rate it orbits the Earth, keeping the same face toward the planet. At right, not tidally locked, if the Moon did not rotate then the face would change over the course of an orbit. Viewed from north; not to scale.

潮汐ロックの仕組みと宇宙における影響

潮汐ロック同期回転天文学
At left, tidally locked, the Moon rotates at the same rate it orbits the Earth, keeping the same face toward the planet. At right, not tidally locked, if the Moon did not rotate then the face would change over the course of an orbit. Viewed from north; not to scale.

潮汐ロックの仕組みと宇宙における影響

潮汐ロック同期回転天文学
At left, tidally locked, the Moon rotates at the same rate it orbits the Earth, keeping the same face toward the planet. At right, not tidally locked, if the Moon did not rotate then the face would change over the course of an orbit. Viewed from north; not to scale.

潮汐ロックの仕組みと宇宙における影響

潮汐ロック同期回転自転周期公転周期
Derivative of −Δt. The axis on the right shows the length of the solar day.

会合日(太陽日)の仕組みと天体ごとの周期的な違い

会合日太陽日恒星日自転周期
An illustration of space weathering's different components.

宇宙風化が天体表面に与える影響とメカニズム

宇宙風化レゴリスナノフェーズ鉄
Ejecta blanket from Hadley C crater filling in Hadley Rille

エジェクタブランケット天体衝突が残す堆積物の科学

エジェクタブランケット衝突クレーター天体地質学