China's retrieved lunar samples weigh less than targeted

Lunar rocks retrieved by a historic Chinese mission to the moon weighed less than initially targeted, but China is still willing to study the samples with foreign scientists, the mission's spokesman said on Monday. China became the third country ever to secure lunar samples when its unmanned Chang'e-5 probe, named after the mythical moon goddess, brought back 1.731 kg of samples last month, falling short of the 2 kg planned.