China's Chang'e-4 lunar probe entered a planned orbit on Sunday to prepare for the first-ever soft landing on the far side of the moon, the China National Space Administration (CNSA) announced. The probe has entered an elliptical lunar orbit with the perilune at about 15 km and the apolune at about 100 km, said CNSA. The control center will choose a proper time to land the probe on the far side of the moon.