Yes, in 2010 there is people gone there and didn't come back yet... We think that i will take about 20 years for them to come back!!
There have been no manned missions to Mercury (or any other planet) due to the great distances involved. Any attempt would require substantial thermal protection because of the intensity of the Sun's...
http://en.wikipedia.org/wiki/Apollo_program 11 manned flights, 7-17, plus Apollo/Soyuz, plus several unmanned early shots.
about 30. that's what my professor told me
There have been six Apollo missions that have landed on the moon.