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Why would it be hard to discover a planet that is closer to the sun than mercury
you cant breath on it
the babylonians
1623
1230
The planet Mercury is known from approx. 4000 years; observations were made only with eyes.
because ...when you look at the sun it hurts your eyes....and it would be harder to see the planet!
When they were looking for the first crescent moon to know when the next lunar month began.
Mercury is a planet.
Mercury is not a dwarf planet. It is a planet.
Mercury is itself a planet - it did not come from a planet!
Mercury is the planet closest to the sun.