josh wickam
The planet Mercury is known from approx. 4000 years; observations were made only with eyes.
Nobody. No human ever set foot on the planet Mercury.
Nobody. Mermaids are not real.
michel angalow
No human con go to the Planet Mercury because it is too hot.
Babylonians
When they were looking for the first crescent moon to know when the next lunar month began.
1995 i believe.
2013
Why would it be hard to discover a planet that is closer to the sun than mercury
No one has ever orbited Mercury, actually no human has ever gone farther than the Moon.
Project Mercury was the first U.S. human spaceflight program, running from 1959 - 1963. Its aim was to put a human in orbit around the Earth. This was achieved by the Mercury Atlas 6 flight on February 20, 1962.