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Discuss two ways of detecting dark matter in distant galaxies and clusters.
Ego
In Freudian theory, the part of the personality that mediates among the demands of the id, the superego, and reality.
Preconscious
The part of the mind containing contents that are not in immediate awareness but can be accessed easily.
Reality Principle
A psychoanalytic concept referring to the capacity of the mind to assess the external world and act upon it appropriately, as opposed to acting on the pleasure principle.
Pleasure Principle
A psychoanalytic concept that describes people's instinctual seeking of pleasure and avoidance of pain to satisfy biological and psychological needs.
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