[4] The source of the ammonia has not been confirmed, but it is associated with the impact process that created Organa crater, perhaps by removing the overlaying layer of water of ice and regolith.

[4] In this scenario, the ammonia may have precipitated from an atmosphere, or soaked the ground from a subsurface source, or diffused out of the existing tholin.

[6] An alternate explanation suggests the deposit of ammonia was delivered by the impactor that created Organa crater.

[3] In either case, it is believed that Organa crater is the result of a recent impact, less than 10 million years ago.

[4] The impact that created Organa crater may have been so recent that the ammonia hasn't yet been destroyed by radiation from space.