Mercury is the closest planet to the sun. Mercury was known since at least Sumerian times roughly 5,000 years ago. Mercury is the smallest planet. It has no moons. The mass is 3.30 x 10^23 5.5% Earth
ROTATE AND ATMOSPHERIC
It takes about 59 earth days. The atmosphere is tenuous and it containes small amounts of sodium, potassium, calcium and magnesium.
TEMPERATURE AND MOONS
100 K [ -173 c; -280 F ] at night to 700 k [ 427 C 800 f ]. And no moons.
Becuse it was more easy than other planets.
Two space craft the first was called Meriner 1. Meriner 10 was the 2.
Mercury is the secound densest planet after earth. The hubble space craft telescope cannot view mercury. The surface of the planet is coverd in craters. The orbital speed of mercury is 47.8 km.
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Public - 9/27/16, 2:31 PM