The only place other than the Earth that humans have physically visited was the
Moon. Exactly twelve (12) American men walked on it, two at a time, between
1969 and 1972, and nobody else has been there since then ... over 40 years.
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Pluto was the only planet not visited by a space mariner space probe.
Mars is the planet that is least unlikely to be visited by humans
Mars is the most likely planet to be visited by humans in the future due to its proximity to Earth, similarity to our own planet, and the ongoing exploration missions being conducted by space agencies.
No, a space shuttle has never visited Mercury. The closest spacecraft to Mercury was the MESSENGER mission by NASA, which orbited the planet from 2011 to 2015.
Humans have landed on the Moon, which is the only celestial body beyond Earth that humans have visited. The first successful manned mission to the Moon was Apollo 11 in 1969.