JWST 發射
JWST 目前位置
https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html
James Webb Space Telescope Science
The James Webb Space Telescope will be a giant leap forward in our quest to understand the Universe and our origins. JWST will examine every phase of cosmic history: from the first luminous glows after the Big Bang to the formation of galaxies, stars, and planets to the evolution of our own solar system. The science goals for the Webb can be grouped into four themes:
- The End of the Dark Ages: First Light and Reionization （用詞的歷史錯誤：之前並沒有中性原子分子被 ionized，只發生電子被原子核抓住，形成中性原子）- JWST will be a powerful time machine with infrared vision that will peer back over 13.5 billion years （～3億年）to see the first stars and galaxies forming out of the darkness of the early universe.
- Assembly of Galaxies - JWST's unprecedented infrared sensitivity will help astronomers to compare the faintest, earliest galaxies to today's grand spirals and ellipticals, helping us to understand how galaxies assemble over billions of years.
- The Birth of Stars and Protoplanetary Systems - JWST will be able to see right through and into massive clouds of dust that are opaque to visible-light observatories like Hubble, where stars and planetary systems are being born.
- Planetary Systems and the Origins of Life - JWST will tell us more about the atmospheres of extrasolar planets, and perhaps even find the building blocks of life elsewhere in the universe. In addition to other planetary systems, JWST will also study objects within our own Solar System.
詹姆斯·韋伯太空望遠鏡（英語：James Webb Space Telescope, JWST）是已發射的紅外線太空望遠鏡，原計劃耗費5億美元並於2007年發射升空[7]。但由於各種原因，導致計畫嚴重超支，發射時間數次推遲，最新預估總耗費高達96.6億美元，發射時間為美國東部時間2021年12月25日7時20分 [8]。2019年8月28日NASA表示該望遠鏡首次組裝完畢[9]。它是歐洲太空總署和美國航空暨太空總署的共用計劃。這是哈柏太空望遠鏡和史匹哲太空望遠鏡的後繼計劃。它擁有一個總直徑6.5公尺(21 英尺)，被分割成18面鏡片的主鏡，放置於太陽─地球的第二拉格朗日點。這意味著其將穩定在地球-太陽連線上地球背後的150萬公里處，而非像哈伯太空望遠鏡那樣繞近地軌道公轉。一個大型遮陽板將保持它的鏡片和四個科學儀器低於50 K（−220 °C；−370 °F）。