第1个回答 2007-12-17
Mercury has extremely thin atmosphere. Therefore, it has great temperature difference between days and nights.
The temperature of its surface can rise above 427 degree celcius in daytime while it can be at a minimum of around -173 (minus 173) degree celcius at night.
Mercury rotation and revolution period, which are on the same direction, are around 58 days and 88 days respectively. Since the rotation period are similar to the revolution period, thus one day on Mercury is much longer than its rotation. One day on Mercury is about 176 days on the Earth, i.e. 88 mornings and 88 evenings. Hence, on Mercury, 1 day equals 2 years.本回答被提问者采纳
第2个回答 2007-12-17
Mercury's atmosphere extremely thin, the diurnal temperaturedifference is very big, daytime the surface temperature may amount toabove 427, the dark night most low temperature may fall to below zero173 about.
Mercury's period of rotation is on 58th, the revolution week contractis 88 days. The rotation direction and the revolution direction aresame. Because the period of rotation and the revolution cycle approachvery much, therefore on a Mercury's day and night must be much longerthan Mercury rotation week-long time. Its day and night is our 176days, daytime and dark night each 88 days. Therefore, on Mercury, "oneday" is equal to "for two years".
应撰是正确的