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Neptune's tilt, like Earth's, means that one hemisphere usually receives more direct light than the other. This gives Neptune its seasons and, surprisingly, an observable spring, as shown in these Hubble images. Cloud bands in the planet's southern hemisphere have been gradually getting brighter since 1980. With a spring that lasts 40 years, the cloud bands are expected to continue to brighten for another 20 years.

Space Telescope Science Institute, Graphics Dept.