Astronomy is a field full of discoveries. The year 2017 witnessed a lot of new discoveries and achievements. In this article, we list 9 top events, in two main categories:Research progress and development of astronomy instruments. The research progress ranges from the detection of neutron star merger to the discovery of habitable exoplanets and the strangest supernova explosion, as well as the most accurate cosmic-ray spectrum measured by China's DAMPE satellite and the first interstellar object, Oumuamua. The development of instruments includes the observation of Sgr A* by the event horizon telescope, successful launch of China's first X-ray satellite, HXMT, the grand finale of Cassini, and the news release from the FAST telescope. These new telescopes have been running well and we expect them to produce more interesting results in the years to come.
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[2] Abbott B P, Abbott R, Abbott T D, et al. GW170814:A threedetector observation of gravitational waves from a binary black hole coalescence[J]. Physical Review Letters, 2017, 119(14):141101.
[3] Collaboration V. GW170817:Observation of gravitational waves from a binary neutron star inspiral[J]. Physical Review Letters, 2017, 119(16):161101.
[4] Collaboration V, Monitor G R B. Gravitational waves and gamma-rays from a binary neutron star merger:GW170817 and GRB 170817A[J]. Astrophysical Journal, 2017, 848(2):L13.
[5] Kasen D, Metzger B, Barnes J, et al. Origin of the heavy elements in binary neutron-star mergers from a g ravitationalwave event[J]. Nature, 2017, 551(7678):80-84.
[6] Gillon M, Triaud A H, Demory B O, et al. Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1[J]. Nature, 2017, 542(7642):456-460.
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[8] Arcavi I, Howell D A, Kasen D, et al. Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star[J]. Nature, 2017, 551(7679):210-213.
[9] Collaboration D, Ambrosi G, An Q, et al. Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons[J]. Nature, 2017, 552(7683):63-66.
[10] Meech K J, Weryk R, Micheli M, et al. A brief visit from a red and extremely elongated interstellar asteroid[J]. Nature, 2017, 552(7685):378-381.
[11] 苟利军. 来自太阳系外的神秘访客"奥陌陌"[EB/OL]. (2017-11-24)[2017-12-25]. https://mp.weixin.qq.com/s/3FW_7zd3cXYs4f6sGBmxTg.
[12] 苟利军,黄月. 视界面望远镜:为黑洞拍下史上第一张"照片"[EB/OL]. (2017-04-05)[2017-12-25]. http://mp.weixin.qq.com/s/najM18MkeOQc0o16iyzXzQ.
[13] Castelvecchi D. How to hunt for a black hole with a telescope the size of Earth[J]. Nature, 2017, 543(7646):478-480.
[14] 中科院高能所计算中心. 硬X射线调制望远镜"慧眼"从酒泉卫星发射中心发射成功[EB/OL].[2017-12-25]. http://www.hxmt.org/index.php/9-zxxx/203-ls.
[15] Li T P, Xiong S L, Zhang S N, et al. Insight-HXMT observations of the first binary neutron star merger GW170817[J]. Science China Physics Mechanics & Astronomy, 2018, 61(3):031011.
[16] Witze A. Cassini's 13 years of stunning Saturn science in pictures[J]. Nature, 2017, 548(7669):513-516.
[17] 辛玲. 别了,卡西尼[EB/OL]. (2017-09-15)[2017-12-25]. http://mp.weixin.qq.com/s/s55Z20m480K8ldWj_T8lsQ.
[18] 中国科学院国家天文台. 国家天文台举办FAST首批成果新闻发布会[EB/OL]. (2017-10-10)[2017-12-25]. http://www.bao.ac.cn/xwzx/zyxw/201710/t20171010_4871382.html.
