After an Eight-Year Journey, Two Spacecraft Have Begun Their Arrival to Mercury, the Inner Solar System's Most Mysterious Planet
https://www.smithsonianmag.com/smart-news/after-an-eight-year-journey-two-spacecraft-have-begun-their-arrival-to-mercury-the-inner-solar-systems-most-mysterious-planet-180989458/
check post at origin
What? The one that’s basically just a rock, with no atmosphere? The one that you could probably study from the comfort of your couch?
I mean, I’m all for new missions to the other planets, but wouldn’t that title go to Venus? The one you would actually have to land on to get an image of the surface? The one with some kind of chemistry going on and even chances of life in the upper cloud regions?
Not sure why they said it’s the most mysteries planet. But, it’s really difficult to shed excess velocity to get to the inner planets. So yeah, there isn’t as much known about it as scientist probably would like to know.