Let's learn Mercury's simple information. Mercury is first planet in solar system.
Let's think Earth is 1.
Mercury is very small. So its diameter is 0.38. So its mass is 0.055. And Mercury has very low gravity. Its gravity is 0.38. It means, Earth’s 1kg is Mercury’s 380g.
M’s diameter:E’s diameter=M’s gravity:E’s gravity. What it’s mean? It means that Mercury’s dencity is simillar to Earth’s dencity. And it has no moon. Mercury is close to Sun, so it's year is 88 Days. But Mercury’s day is 59 Days.
Diameter:0.38
Mass:0.055
Gravity:0.38
Moon:No
Year:88days
Day:59days
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