yes cassinni
no
I don't know of any planet with exactly 21 known moons. The best answer is probably "Uranus" with 27 moons (natural satellites).
did any robots or satellites arrive on Saturn and what are there names and what year
have any robots or satellites ever landed on pluto
Uranus would be the great grandfather of Athena.
Yes
yes
does saturn have satellites or robots
no
everything sucks
No they mostly looked at Mars.
no
yes cassinni
no there hasnt been any robots or anything
true
it has neither. also there are no man made orbiting spacecrafts.
Yes, there are satellites in orbit that record information about our planet.