The thin silver of Saturn’s moon Prometheus lurks near ghostly structures in Saturn’s narrow F ring in this view from our Cassini spacecraft.
August 07 | 2017
Many of the narrow ring’s faint and wispy features result from its gravitational interactions with Prometheus. Most of the small moon’s surface is in darkness due to the viewing geometry here. Cassini was positioned behind Saturn and Prometheus with respect to the Sun, looking toward the moon’s dark side and just a bit of the moon’s sunlit northern hemisphere. Credit: NASA/JPL-Caltech/Space Science Institute
Darker, cooler areas on the Sun – known as sunspots – have been absent for almost two weeks, as of Feb. 1.
February 06 | 2018
A single, tiny one appeared on Jan. 31, but even that is hard to see in this rotating view from our Solar Dynamics Observatory. The video shows a rotating sun in filtered light for the past week, but it is even hard to tell the sun is rotating since there are just about no features. This spotless period is a prelude to the approaching period of solar minimum next year, when the Sun’s activity will be at the low end of its 11-year cycle. Credit: NASA/SDO