关于四大行星的资料什么都行（请用英语回答）

水星
Mercury
planet closest to the Sun, revolving around it at an average distance of 58 million kilometres.

Mercury's orbit is inside the orbit of the Earth, and this creates two important astronomical effects. First, Mercury is never more than 27°45′ of angle away from the Sun and is thus seenas a “morning” star just before sunrise or an “evening” star just after sunset. Second, Mercury exhibits phases much like the Moon: when it lies nearly between the Earth and the Sun (inferior conjunction), it appears as a thin crescent; when it is at its greatest separation (or elongation) from the Sun, the apparent disk is half-illuminated; and when it is on the opposite side of the Sun from the Earth (superior conjunction), its fully illuminated surface is visible. Since these changes in phase occur because of the motion of Mercury in its orbit, its apparent size also varies with the phase. It is largest at inferior conjunction (about 10〃 of arc, or 1/180 the apparent