Everyone knows what causes yellow snow - but what about orange?
Pictures of the unusual phenomenon have been posted on social media from people in Russia, Bulgaria, Ukraine, and Moldova, after their neighbourhoods were left looking like the surface of Mars.
But it isn't a sign of the coming apocalypse - the answer can be found in a terrifying weather event.
Dust storms currently raging across Southern Europe are shifting sand from the Sahara desert northwards - leading it to mix with the cooling water in colder climes.
As a result, orange sandstorms have rolled across Spain, Portugal and Cyprus.