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.
Scientists on the radar team are confident that the feature is not an artifact, or flaw, in their data, which would have been one of the simplest explanations. They also do not see evidence that its appearance results from evaporation in the sea, as the overall shoreline of Ligeia Mare has not changed noticeably. The team has suggested the feature could be surface waves, rising bubbles, floating solids, solids suspended just below the surface, or perhaps something more exotic.
That the seasons are slowly changing on Titan is probably contributing to the transient nature of this feature.
I have this problem as well with not just online courses but several video "tutorials". It's been numerous times recently that I've googled for for "how do I
google "how do i
Man, that looks like a pretty cool game! How can I contribute?
There really isn't that fine a line between "stuff we have evidence for" and "stuff people believe without evidence".
Sometimes the latter becomes the former. Sometimes elements of the latter just slip away in the history. Lots of times, people just keep on believing.
I bet you're a lot of fun at parties.
"We learn from history that we learn nothing from history." -- George Bernard Shaw