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.

gravitational waves  /  DAMPE  /  Oumuamua  /  HXMT  /  Cassini  /  FAST