2025年1月16日天文系系主任換屆，通過民主推薦和考察，經學校研究決定，清華大學講席教授李菂擔任系主任一職。原系主任毛淑德教授不再擔任系主任。
毛淑德于2014年任清華大學任天體物理中心（天文系前身）主任，2019年開始擔任新成立的天文系首任系主任。在任期間，積極引進國內外優秀青年師資，推動大科學項目發展，搭建國際化培養平臺，搬遷新辦公樓。毛淑德牽頭基金委創新群體、國家重點研發計劃等多項科研項目，在本科生教學、研究生培養方面積極作為，培養了一批青年人才，為天文系的早期發展做出了貢獻。在交接工作中，毛淑德老師表示將不遺余力，繼續關心支持天文系發展。
李菂老師表示，感謝毛淑德老師的貢獻，感謝學校及同事的信任和肯定，表示將竭盡全力投入工作，團結帶領全系教師不斷開創事業發展新局面。
現在附上新任主任李菂對全系的寄語：
人類擁有同一片天空，每個人卻有自己的宇宙。
從玉泉路到永定路就是我小時候宇宙膨脹的極限。中關村和清華大學那時只能是幼年宇宙學理論上的可能。即使這樣有限的宇宙，也有復雜的事物和難解的存在。所以成年以后，第一次看到開普勒的日記，雖然能看懂卻大受震撼。大意是他剛剛完成了三定律，猜測這樣神圣而優美的見解估計還需要100年才能被世人接受：“十年或百年都無關緊要。我找到了天堂的定律。”這是幾乎荒廢一生試圖純用正多面體構建宇宙學的開普勒，也是多次面臨經費困難、親人夭亡的開普勒。他的定律還在被使用。其更深刻的影響是表明了天空存在法則，而法則可以被個人揭示，被人類理解。
我們比開普勒幸運的多。我們有清華大學的支持。我們有李惕碚、陶嘉琳、毛淑德這些具備遠見卓識的實干家。我們有最優秀的學生。從2019年4月21日開始，我們還有了天文系這樣一個家園，支撐對天堂的定律的探究。目前，天文系有將近20位全職教師，主要從事高能天體物理、星系宇宙學、系外行星和射電天文4個方向。天文系的規模在迅速擴大的中國天文領域中并不顯著，也凸顯了清華天文進一步發展需要強調系統原創、交叉學科的必要性。作為原創和交叉的范例，寬視場巡天望遠鏡（MUST）和宇宙熱重子探尋計劃（HUBS）都進入了《清華大學2030創新行動計劃》，成為清華大學天文系的發展重心。
“博學之，審問之，慎思之，明辨之，篤行之。”天文系將依托前輩奠定的基礎，踐行學校內涵式發展的戰略，嘗試開拓動態宇宙“時間前沿”等探索方向，揭示天空共同的法則，拓展每一個宇宙的邊界。
李菂
2025年1月17日
Humanity shares the same sky, yet each person has their own universe.
From Yuquan Road to Yongding Road marked the limits of my expanding universe during childhood. Back then, places like Zhongguancun and Tsinghua University were no more than theoretical possibilities within my adolescent cosmology. Even within such a confined universe, there were already intricate phenomena and enigmatic existence. When I came across Kepler’s diary for the first time, I was profoundly touched. He had just formulated his three laws and suspected that such sacred and elegant insights have to take another hundred years to be widely accepted: “ten or a hundred years—time is inconsequential. I have discovered the laws of heaven.” This was the Kepler: who almost wasted a full lifetime trying to build a cosmology with regular polyhedrons. This was the Kepler who endured numerous financial hardships and the loss of loved ones. His laws are still in use today. Even more profoundly, his laws demonstrate that the sky follows rules—rules that can be discovered by individuals and understood by humanity.
We are far more fortunate than Kepler. We have the support of Tsinghua University. We have visionary and pragmatic pioneers, such as Li Tipei, Tao Charling, and Mao Shude. We have the most outstanding students. And as of April 21, 2019, we have a home, the Department of Astronomy, for exploring the laws of heaven. Currently, the department has nearly 20 full-time faculties, focusing on four main areas: high-energy astrophysics, galaxies and cosmology, exoplanets, and radio astronomy. Such a scale is not prominent in the rapidly expanding field of astronomy in China. Tsinghua Astronomy has to emphasize systematic originality and interdisciplinary research. Exemplifying this vision, the MUltiplexed Survey Telescope (MUST) and the Hot Universe Baryon Surveyor (HUBS) have been included in the《Tsinghua University 2030 Innovation Action Plan》and thus the key focal points for the department’s development.
“Study extensively, inquire earnestly, think carefully, discern clearly, and act resolutely.” Building on the foundation laid by our predecessors, the Department of Astronomy at Tsinghua University will carry forward the school’s strategy of intrinsic growth, will explore new horizons such as the dynamic universe’s “time frontier”, will strive to reveal the common laws of the sky as well as to extend the boundaries of every individual universe.
Di Li
2025-01-17
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