article_snippet.sent: But experts are still at a loss to explain the composition and source of the bright spots.
article_snippet.sent: The fact these mysterious bright white spots are in a crater - where such an impact occurred - supports this theory.
article_snippet.sent: Another possibility is that these mysterious bright white spots are cryovolcanoes - volcanoes that are shooting out water or ice.
article_snippet.sent: However, the lack of a raised area around the spots consistent with a volcano suggests this might not be correct.
article_snippet.sent: And the lack of a raised area around the spots consistent with a volcano could even be water vapour ejecting from a liquid reservoir under the ground, although again current observations - namely a lack of additional material near the spots - suggests this is not the case.
article_snippet.sent: But the origin of the bright spots remains a mystery for now - with theories ranging from exposed ice to volcanoes.
article_snippet.sent: Salt flats or ice seem to be the predominant theories at the moment, with the bright spots appearing to reflect incoming sunlight towards the spacecraft’s cameras.
article_snippet.sent: Several theories currently exist for what Several theories might be, with the favoured being salt flats or ice - both reflecting sunlight .