Three topics will be discussed hopefully to give some clues for future Korean
lunar and planetary missions. First topic is a scientific result of Japanese
lunar exploration, Kaguya. Gravity measurement of the far side of the Moon
by using a relay sub-satellite has revealed marked difference of mascon
features between near and far sides indicating endogenic origin of lunar
dichotomy. But there remains many unresolved issues in lunar sciences.
The second topic is an introduction of ongoing asteroid mission, Hayabusa-2.
Unlike big, well-planned missions of NASA and ESA, Japanese space
scientists have been forced to achieve the most outcomes from the least
budget and human resource because of the limit of our nation's economy and
power. And Korean space scientists, maybe, face the similar problem with
ours in the future. Then an experience of small mission like Hayabusa-2 will
help designing future Korean missions. The third topic is a decadal survey
activity in Japanese community of planetary scientists. Space programs can
be initiated by a leadership of the government, however, the programs will
not continue without strong supports of science community. Unfortunately,
university researchers are very difficult to unite and share a common goal.
An effort of Japanese community to organize a new mission by scientists,
not JAXA, is reported.