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天文学

310 件の記事

Diagram of the early Solar System's protoplanetary disk, out of which Earth and other Solar System bodies formed

太陽系構造から構成天体までを網羅する宇宙の旅

太陽系惑星準惑星太陽
Cabeus Crater.

カベウス・クレーター月南極に眠る水と氷の秘密

カベウス・クレーター月南極LCROSS水氷
An overview of electromagnetic radiation absorption. This example discusses the general principle using visible light. A white beam source – emitting light of multiple wavelengths – is focused on a sample (the complementary color pairs are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) are absorbed in order to excite the molecule. Other photons transmit unaffected and, if the radiation is in the visible region (400–700 nm), the sample color is the complementary color of the absorbed light. By comparing the attenuation of the transmitted light with the incident, an absorption spectrum can be obtained.

吸収分光法光の吸収から物質の正体を突き止める分析技術

吸収分光法電磁波分光分析Beer-Lambert法
Lunar north polar region mosaic by LRO. The north pole is in the center.

月北極の地理的特徴と探査の歴史

月北極月面地理クレーター月探査
Gene and Carolyn Shoemaker, 1994

ユージーン・シューメーカー惑星地質学の先駆者が切り拓いた宇宙の記憶

ユージーン・シューメーカー惑星地質学アストロジオロジーシューメーカー・レヴィ9
A historic extraterrestrial sky—Earthrise, the Earth viewed from the Moon. Taken by Apollo 8 astronaut William Anders while in lunar orbit, December 24, 1968.

地球外の空太陽系各惑星から見える宇宙の景色

地球外の空天文学惑星の景色視直径
SOFIA was an infrared telescope in an aircraft, allowing high altitude observations

赤外線望遠鏡の仕組みと進化宇宙の不可視な光を捉える技術

赤外線望遠鏡天文学電磁スペクトルジェイムズ・ウェッブ宇宙望遠鏡
This modern liquid-mirror telescope aims upward

天頂望遠鏡の仕組みと天文学における役割

天頂望遠鏡天頂天文学液体鏡望遠鏡
Diagram of the Moon's phases shown in the outer perimeter as seen from the northern hemisphere. The Earth is at the center of the diagram and the Moon is shown orbiting.

月の満ち欠け月相のメカニズムと観測の基礎知識

月の満ち欠け月相新月満月
A medieval clock in Prague, Czechia

月(Month)の定義と世界各地の暦における多様な形式

太陰月グレゴリオ暦
World map showing the first day of the week used in different countries according to the Common Locale Data Repository[9] Monday Friday (Maldives only) Saturday Sunday

週(ウィーク)の定義と歴史7日周期の起源から現代の規格まで

カレンダー7日周期ISO 8601
A page from the Hindu calendar 1871–72

太陰太陽暦の仕組みと世界各地の暦体系

太陰太陽暦ルニソーラーカレンダーメトン周期閏月