Stars probably would be visible from the surface during the day. Scans of Mercury made by earth-based radar indicate that craters at Mercury's poles contain water ice. The floors of the craters are permanently shielded from sunlight, so the temperature never gets high enough to melt the ice. Mercury is surrounded by an extremely small amount of helium, hydrogen, oxygen, and sodium. The plant and animal life of the earth could not live on Mercury because of the lack of oxygen and the intense heat.
Scientists doubt that the planet has any form of life.
Density and mass. That is, a portion of Mercury would weigh slightly less than an equal portion of the earth. Mercury's smaller mass makes its force of gravity only about a third as strong as that of the earth. An object that weighs 100 pounds on the earth would weigh only about 38 pounds on Mercury. Flights to Mercury.