韋伯望遠鏡拍攝的紅外木星和木星環
Jupiter and Ring in Infrared from Webb
發表日期：2025-04-02
木星為什麼有星環？ 1979 年，美國國家航空航天局（NASA）路過木星的航海家 1 號（Voyager 1 ）宇宙飛船發現了木星的主環，但它的起源當時還是個謎。 然而，美國宇航局的伽利略號飛船在 1995 年至 2003 年期間圍繞木星執行所獲得的資料證實了這一假設，即木星環是由流星體撞擊附近的小衛星而形成的。 例如，當一顆小流星體撞擊到小梅蒂斯衛星時，它會鑽入衛星，蒸發，並將汙垢和塵埃帶入木星軌道。詹姆斯-韋伯太空望遠鏡拍攝的木星紅外影像不僅顯示了木星及其雲層，還顯示了木星環。木星的大紅斑（GRS）--右側顏色相對較淺，木星的大衛星木衛二--位於左側衍射峰的中心，以及木衛二的陰影--在大紅斑旁邊--也清晰可見。影像中的一些特徵還不太清楚，包括木星右緣看似分離的雲層。 天體驚喜你的生日是哪一天？
原文：Why does Jupiter have rings? Jupiter's main ring was discovered in 1979 by NASA's passing Voyager 1 spacecraft, but its origin was then a mystery. Data from NASA's Galileo spacecraft that orbited Jupiter from 1995 to 2003, however, confirmed the hypothesis that this ring was created by meteoroid impacts on small nearby moons. As a small meteoroid strikes tiny Metis, for example, it will bore into the moon, vaporize, and explode dirt and dust off into a Jovian orbit. The featured image of Jupiter in infrared light by the James Webb Space Telescope shows not only Jupiter and its clouds, but this ring as well. Jupiter's Great Red Spot (GRS) -- in comparatively light color on the right, Jupiter's large moon Europa -- in the center of diffraction spikes on the left, and Europa's shadow -- next to the GRS -- are also visible. Several features in the image are not yet well understood, including the seemingly separated cloud layer on Jupiter's right limb. Celestial Surprise: What picture did APOD feature on your birthday? (post 1995)
※ 本文由萌芽機器人自動轉貼自每日一天文圖（Astronomy Picture of the Day，APOD），原文為英文，正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理，內容僅供參考，若有任何錯誤之處還請見諒！
關於每日一天文圖：每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務，網站每天提供一張影像或圖片，並由天文學家撰寫扼要說明其特別之處。