Among the planets in the solar system, Mercury, which is the closest to the sun, has no atmosphere. Under the direct sunlight during the day, its surface temperature reaches 427°C, and at night it is as low as -170°C. What is the temperature difference between day and night on the surface of Mercury?
在太阳系的行星中，离太阳最近的水星由于没有大气，白天在阳光的直接照射下，表面温度达427℃，夜晚则低至-170℃，则水星表面昼夜的温差为多少℃．
<gadget id="calculator">427 - (-170)</gadget>
<output>597</output>

<result>597</result>