2026年1月20日
Io in True Color
Image Credit: NASA, JPL, Galileo Project
Explanation: The strangest moon in the Solar System is bright yellow. The featured picture, an attempt to show how Io would appear in the “true colors” perceptible to the average human eye, was taken in 1999 July by the Galileo spacecraft that orbited Jupiter from 1995 to 2003. Io’s colors derive from sulfur and molten silicate rock. The unusual surface of Io is kept very young by its system of active volcanoes. The intense tidal gravity of Jupiter stretches Io and damps wobbles caused by Jupiter’s other Galilean moons. The resulting friction greatly heats Io‘s interior, causing molten rock to explode through the surface. Io’s volcanoes are so active that they are effectively turning the whole moon inside out. Some of Io‘s volcanic lava is so hot it glows in the dark.
Tomorrow’s picture: open space
真实色彩的木卫一
图片来源: NASA, JPL, Galileo Project
说明: 太阳系中最奇特的一颗卫星表面是鲜亮的黄色。这张由伽利略号木星探测器于1999年7月拍摄的特色图片，试图还原木卫一在普通人眼中“真实色彩”。该探测器自1995年至2003年围绕木星运行。木卫一的颜色源于硫和熔融硅酸盐岩石。其异常年轻的表面是由活跃的火山系统造成的。木星强大的潮汐力不断拉伸木卫一，并削弱由木星其他伽利略卫星对其引起的摆动。由此产生的摩擦极大地加热木卫一内部，导致熔岩从表面喷发而出。木卫一的火山活动极为活跃，以至于整颗卫星正在被由内而外地翻转。部分木卫一的火山熔岩温度极高，甚至在黑暗中发出光芒。
明日的图片: open space
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