Plenty - see related link for a list
yes
none
None.
No, there have not been any space missions that have visited Uranus. The Voyager 2 spacecraft is the only spacecraft to have passed by Uranus, conducting a flyby in 1986. There are currently no upcoming missions planned to visit Uranus.
The first rendezvous in space occurred during the Gemini 6 and Gemini 7 missions in December 1965. The two spacecrafts came within a few feet of each other, establishing that space rendezvous was possible and paving the way for future space missions.
The Kennedy Space Center was built in 1965. The Kennedy space center is located in Merritt Island, Florida.
Spirit and Opportunity are two.
Yes, Voyager II has. (Voyager II is an unmanned space probe).
No space missions have landed on Neptune or flown by it. The only spacecraft that has visited Neptune is Voyager 2, which conducted a flyby of the planet in 1989. There are no current plans for future missions to Neptune.
MDA Space Missions was created in 1999.
The Space Shuttle Discovery completed a total of 39 missions during its operational period from 1984 to 2011. It was notable for being involved in significant missions such as deploying the Hubble Space Telescope and assembling the International Space Station. Discovery flew more missions than any other shuttle in NASA's fleet before its retirement.
There have been no human space missions to Mars. The only missions to Mars to date have been through flybys with space craft, orbiters, and land rovers.