re: Good news & bad news about Japan's deep-space programs.
"Survivable penetrator-probe technology for planets or moons won't work.
If you disagree, show me the proof that the technology will work?"
If they worked for asteroids and comets why won't they work for moons?
The penetratable part worked for asteroids and the penetratable AND retreatable part worked for comets(Stardust mission).
Let's not give up the (any) ship yet.