By Xinhua writers Yu Fei, Quan Xiaoshu and Qu Ting JIUQUAN, June 15 (Xinhua) — China launched its first X-ray space telescope to observe black holes, pulsars and gamma-ray bursts, via a Long March-4B rocket from Jiuquan Satellite Launch Center in northwest China’s Gobi Desert at 11 a.m. Thursday. The 2.5-tonne Hard X-ray Modulation Telescope […]