The Expanding Universe

Galaxies do move through space, towards or away from other galaxies. Our galaxy and the Andromeda galaxy are moving towards each other through existing space. However, for galaxies outside our local group the real influence in galaxy movement is Dark Energy. Dark Energy actually increases the amount of space that exists between galaxies which is why the universe is literally expanding. The more space there is between galaxies means that there is more space being created between them which means that the farther away a galaxy is the faster it is moving away.

(Great Courses – Dark Matter Dark Energy)                                                                                      (Great Courses – Cosmology: The History and Nature of our Universe)

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