A NASA-funded study finds a drop in the number of bright clumps in one of Saturn's rings over the past 30 years, suggesting small moonlets there have been on the decline.
The launch of a NASA ocean winds sensor to the International Space Station (ISS) this month inaugurates a new era of Earth observation from the space station's vantage point.
Scientists have found evidence of plate tectonics on Jupiter's moon Europa. This indicates the first sign of this type of surface-shifting geological activity on a world other than Earth.
