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The Advanced Telescope for High ENergy Astrophysics (ATHENA) is a planned X-ray telescope. It is the second (L2) large class mission within ESA Cosmic Vision Program. ATHENA will be one hundred times more sensitive than the best of existing X-ray telescopes—Chandra X-ray Observatory, and XMM-Newton. The primary goals of the mission are to map hot gas structures, determining their physical properties, and searching for supermassive black holes. ==History and development== Previously, the telescope was a candidate for the first (L1) L-class Cosmic Vision mission, but lost to the Jupiter Icy Moon Explorer. ATHENA came about from an ESA reboot of the International X-ray Observatory project planned by ESA, JAXA and NASA from about 2008 to 2011. A changing set of conditions lead to changes, in part because a NASA withdrawal from IXO. IXO had itself resulted from a 2008 proposal merger, including ESA's XEUS. The mission was selected as a second large mission of the Cosmic Vision programme. The final decision about rebooting the International X-ray Observatory took place on the 27 of June 2014.〔 The selected science topic is "Hot and Energetic Universe" with an objective of answering to questions from astrophysics: How does ordinary matter assemble into the large-scale structures we see today? And how do black holes grow and shape the universe? The science team was appointed on 16 July 2014. Initial vibration testing of a silicon pore optics mirror module took place in August 2014. ESA's Science Programme Committee will meet in 2019 for a full review and final approval of the project before construction to begin in the same year.〔 In September 2015, the first conference dedicated to science and exploration the telescope would allow and to the future of the observatory was planned.〔()〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Advanced Telescope for High Energy Astrophysics」の詳細全文を読む スポンサード リンク
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