Yes, there have been probes sent to Mercury. Messenger and Mariner 10.
Astronauts don't go to Mercury it's too hot and they could send probes or spacecraft there much more cheaply, safely, and easily if they really needed to.
aliens
No probes or vehicles have ever landed on Mercury.
2
Yes, the Voyager missions were run by NASA and they sent the probes.
yes,because there were space-probes and unnamed crafts that found Venus dust-covered and windy
radio
As of 2014, humans have not set foot on the planet Mercury. To date, the only probes sent have been Mariner 10 which did a flyby, and the MESSENGER orbiter; both probes from NASA.
No one has every been to Mercury. The furthest man has been is to the Moon. Probes have been sent to Mercury
No, not with any manned missions. The energy would fry anything that comes close. Perhaps we will be able to send probes to reasonable distances, or to Mercury, to make observations. We currently have probes in our general vacinity that are taking amazingly beautiful and informative 3D images of the sun.
We use space probes, and send astronauts... etc.