Mercury is the innermost of the known planets found in our solar system. Mercury is very small. With a diameter of just 4840 km, it is not much bigger than our moon. Most likely, it is so small that the sun shaped the 4.6 billion years ago. Its mass is about 18 times smaller than the Earth.
Mercury's orbital period, one Mercury year is 88 days.
The rotation time, a Mercury day is 59 days which represents almost 2/3 of the rotation.
Because out of this, the difference between night and dagtempratur very large.
On the day it can be up to +420 ° C and at night down to
-100 ° C.
Mercury is like the earth an iron core that probably is melted. But Mercury core is 75% of its radius, compared to the earth 55%. It generates the magnetic field around Mercury. There are also traces of oxygen, helium and hydrogen above the surface. But the atmosphere in the true sense does not exist, since gravity (0.37g) would not be enough to keep it for longer.
Because out that it is so close to the sun, it has been difficult to observe by conventional terrestrial methods. The first successful närstudierna made from the American space probe "Mariner 10" in 1975. These show that its surface is very similar to the moon and Mars and is covered mostly of very old craters and Ringberg.
Mercury Passage, the time when the planet passes over the solar disk which occurs about 13 times per century.
The planet is named after the Roman god Mercury.based on 2 ratings Mercury,