Out in the outer solar system, a lonely human spacecraft has spotted something. JPL describes it thusly:
The press release adds more details, and develops the mystery:
The mysterious feature, which appears bright in radar images against the dark background of the liquid sea, was first spotted during Cassini's July 2013 Titan flyby. Previous observations showed no sign of bright features in that part of Ligeia Mare. Scientists were perplexed to find the feature had vanished when they looked again, over several months, with low-resolution radar and Cassini's infrared imager. This led some team members to suggest it might have been a transient feature. But during Cassini's flyby on August 21, 2014, the feature was again visible, and its appearance had changed during the 11 months since it was last seen.
Gothically-skilled readers will enjoy the Edgar Allan Poe link in that passage. (Hint: what's the name of the sea?)