太阳壁纸
by Enhanced Image by Kevin M. Gill (CC BY 3.0) based on images provided Courtesy of NASA/JPL-Caltech/SwRI/MSSS
NASA Image Library · 公有领域（Public Domain）
关于这张图
Jupiter's volcanically active moon Io casts its shadow on the planet in this dramatic image from NASA's Juno spacecraft. As with solar eclipses on the Earth, within the dark circle racing across Jupiter's cloud tops one would witness a full solar eclipse as Io passes in front of the Sun. Such events occur frequently on Jupiter because it is a large planet with many moons. In addition, unlike most other planets in our solar system, Jupiter's axis is not highly tilted relative to its orbit, so the Sun never strays far from Jupiter's equatorial plane (+/- 3 degrees). This means Jupiter's moons r…
