China sent two satellites for the detection of gravitational waves into planned orbit from Xichang Satellite Launch Center in southwest China's Sichuan Province on Thursday morning. The two satellites will be used to monitor high-energy celestial phenomena, such as gravitational wave gamma-ray bursts, high-energy radiation of fast radio bursts, special gamma-ray bursts and magnetar bursts, besides studying neutron stars, black holes and other compact objects and their merger processes.