Mercury '1 day' by 2 years

Mercury is the closest planet to the Sun, the Earth's uncle, less than half the Earth's diameter. Of the 9 planets, Mercury ranks second. Although called Mercury but not

Picture 1 of Mercury '1 day' by 2 years

(Photo: dustbunny)

Mercury is the closest planet to the Sun, the Earth's uncle, less than half the Earth's diameter. Of the 9 planets, Mercury ranks second.Although called Mercury, there is not a single drop of water, completely a dead world . Mercury has no atmosphere so the day and night temperature is very different. Because near the Sun, daytime temperatures reach 500 degrees Celsius, at night the temperature dissipates very quickly the surface down to -170 degrees Celsius, day and night temperatures vary by more than 600 degrees Celsius . With such an environment it is difficult to find traces of life.

The speed of rotation around Mercury's Sun is very fast, a circle equivalent to 88 days on Earth. But the speed of self-turning is very slow, one rotation is equivalent to 59 days on Earth. The afternoon turns in the same direction with the direction of the Sun, so a day and night on Mercury is much longer than the time of Mercury's rotation. According to calculations, one day and night on Mercury is 176 days, daytime and night each day about 88 days. If calculated as for Earth, Mercury's every rotation is 1 year, 1 day in Mercury is its "1 day", then "1 day" on Mercury is equivalent to "2 years " its.

Picture 2 of Mercury '1 day' by 2 years
The image of Mercury captured by the Mariner 10 probe (Photo: jpl.nasa) Because one day and night on Mercury is so long, on the star Thuy looks at the Sun, the Sun seems to stand still. On the other hand, the orbits of Mercury are flat elliptical (the point is 46 million km from the nearest Sun, the farthest point is 70 million km), moreover a "day" session of Mercury is just in line with an orbit so During the day of Mercury, the size of the Sun becomes half the difference.

From the Earth to look at Mercury it is a little red, but darker than Venus but still considered a bright star in the sky. Because it is close to the Sun, it is often blurred by the Sun. On March 16, 1975, the probe "Sailor 10" (Mariner 10) flew in the sky of Mercury just 320km away, taking several thousand photos. Looking at the picture, it is clear that Mercury's surface is covered with circular shaped mountains, fields, valleys and geomorphologic terrain very similar to the Moon.

Update 17 December 2018
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