Back in January astronomers got one of their first close-up glimpses of dwarf planet Ceres, and they were baffled.
The tiny planet is the largest chunk of rock in the asteroid belt that hangs between Mars and Jupiter, and those close-up images, captured by NASA's Dawn spacecraft, revealed two huge, and hugely mysterious, bright spots on the surface.
The problem is that no one knows what in the world they are — and the more we observe and photograph them, the more complicated and confusing they get.
And people have some crazy theories about what they might be.
Maybe they're some kind of hybrid water volcano:
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