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Those are not the only two options. Besides, we still routinely fail to spot asteroids until they get close to Earth or pass by. There may be more dwarf plane

Those are not the only two options. Besides, we still routinely fail to spot asteroids until they get close to Earth or pass by. There may be more dwarf planets like Pluto, or a major planet the size of Neptune (per Caltech researchers, so called Planet Nine or Planet X) in our own solar system and we can't easily find them. No need to intentionally hide from the primitive humans that are still struggling to locate large objects in their solar system and near their planet.

kentonv 6y ago
The existence of other planets doesn't seem to explain why they wouldn't colonize Earth. I would expect them to go everywhere.
- s1artibartfast 6y ago
  What would the point of going everywhere be?
  - kentonv 6y ago
    To harvest all available resources in the service of whatever higher goal the civilization has.
  - scotth 6y ago
    Maximize resource collection and manufacturing? Surely there's usefulness in raw materials.