'We have seen soft landings in the past but it is still something difficult to do'
Japan became on Saturday only the fifth nation to achieve a "soft landing" on the Moon, but its space agency said that the craft's solar cells were not generating power. This has done before, "we have seen 'soft landings' in the past from the United States, the Soviet Union, China and India, but it is still something that is difficult to do", said Jill Stuart, expert in the politics, ethics and law of outer space exploration and exploitation.