Dong Fang Hong 1, in the western world also known as China 1 or PRC 1, was the first space satellite of the People's Republic of China (PRC), launched successfully on 24 April 1970 as part of the Dongfanghong program. It was a part of the "Two Bombs, One Satellite" program. At 173 kg (381 lb), it was heavier than the first satellites of other countries. The satellite carried a radio transmitter which broadcast the then de facto national anthem of the same name. The broadcast lasted for 20 days while in orbit.