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On This Day, July 23
- 2018: A wildfire in East Attica kills at least 102 people. It is the deadliest wildfire in the history of Greece.
- 2015: NASA announces discovery of Kepler-452b by the Kepler space telescope.
- 2014: TransAsia Airways Flight 222 crashes in Xixi village near Huxi, Penghu, during approach to Penghu Airport. Forty-eight of the 58 people on board are killed and five more people on the ground are injured.
- 2012: The Solar storm of 2012 was an unusually large coronal mass ejection that was emitted by the Sun which barely missed the Earth by nine days. If it hit, it would have caused up to US$2.6 trillion in damages to electrical equipment worldwide.
- 2011: A high-speed train rear-ends another on a viaduct on the Yongtaiwen railway line in Wenzhou, Zhejiang province, China, resulting in 40 deaths.