re: The probe wieghs 3 tons...The Apollo command modules weighed 5 tons.
Fully-loaded, you are quite correct; nearly 6 metric tons
is what a totally supplied and equipped CM did weigh.
The Apollo CM would however weigh
close to 5 tons stripped down.
I chose to make a comparison in weights to show
that Japan's space program is starting to
show ambitious potential for the near-future/
By further increasing the power and mass of their H2A booster
anywhere from 10 to 20 percent, the Japanese space agency
would have a decent shot at developing and launching a Zond-type spacecraft to the moon.
cheers.
Jacob