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天文学

308 件の記事

A comet was mentioned in the Anglo-Saxon Chronicle and by the Venerable Bede in the year 729 CE.[13][14]

彗星の正体と宇宙の旅氷と塵の天体が描き出す神秘

彗星ハレー彗星オールトの雲エドモンド・ハレー
Lakshmi Planum (left) and Maxwell Montes (right) in a Magellan radar map. The highlands are covered in bright "snow," rising 5 km (3.1 mi) above the dark lava flows of the neighboring plain.[1]

金星の「雪」の正体高地を白く染める金属化合物の謎

金星金星の雪硫化鉛硫化ビスマス
The positive pole of a planet is defined by the right-hand rule: if the fingers of the right hand are curled in the direction of the rotation then the thumb points to the positive pole. The axial tilt is defined as the angle between the direction of the positive pole and the normal to the orbital plane. The angles for Earth, Uranus, and Venus are approximately 23°, 97°, and 177° respectively.

自転軸の傾き(黄道傾斜角)が惑星の気候と季節に与える影響

自転軸の傾き黄道傾斜角季節のメカニズム地球の公転
Sagan (age 16) in the 1951 Rahway High School yearbook

カール・セーガン宇宙の神秘を世界に届けた科学の伝道師

カール・セーガンコスモス天文学SETI
Precessional movement of Earth. Earth rotates (white arrows) about once a day around its rotational axis (red); this axis itself rotates slowly (white circle), completing a rotation in approximately 26,000 years[1]

地軸の歳差運動地球の回転軸が描く26,000年の巨大なサイクル

歳差運動地軸春分点天文学
Orbits and trajectories of Mariner 2, Venera 4, Pioneer Venus Orbiter, and Venus Express

Venus Express欧州初の金星探査機が明かした大気の謎

Venus Express欧州宇宙機関ESA金星探査
The heart-shaped Tombaugh Regio, on Pluto, is named after the dwarf planet's discoverer Clyde Tombaugh.

惑星命名法太陽系天体の地名決定ルールと国際基準

惑星命名法IAU国際天文学連合天体地名
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金星の地形学多様な地名と地質学的特徴の体系的まとめ

金星地形惑星地質学ヴァリス
Perspective rendering of Ishtar Terra, at the center of the image is Maxwell Montes, according to its elevation in red and its peaks in white.

イシュタル高地金星の北端に位置する巨大な大陸地帯

イシュタル高地金星マックスウェル山脈惑星地形
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天体の内部加熱宇宙を動かすエネルギー源のメカニズム

内部加熱天文学重力収縮核融合
Retrograde orbit: the satellite (red) orbits in the direction opposite to the rotation of its primary (blue/black)

逆行運動のメカニズム天文学における回転と公転の不思議

逆行運動順行公転周期自転軸
Asteroid 65 Cybele and two stars in the constellation Aquarius, with their magnitudes labeled

見かけの等級とは?天体の明るさを測る仕組みと基準を解説

見かけの等級絶対等級天文学星の明るさ