I was going through an old index I have recently discovered and found this odd white egg shaped structure on the moon Europa. The center top of the structure is open and the sides are curved like a flower that is partly open. Its the only such object with such a unique shape and size. This object is several km tall and over 5km wide. The chances of this being an a̳l̳i̳e̳n̳ base is very high. The tall white walls are there to protect the city. Absolutely amazing!