space expands into itself

The expansion of space occurs by means of packing more space quanta into the same volume. The scale factor within the volume increases, without there necessarily being a corresponding increase in the scale factor and hence area of the space on the perimeter of the volume. 

The expansion of the universe

Submitted by jhwierenga on Mon, 07/30/2018 - 08:01
icon of expanding balloon

The universe expands because quantum fluctuations continually produce new space quantum systems. It expands into itself locally, in such a manner that surrounding space is not directly affected.

Phenomena explained :

Galactic rotation curves: The velocity at which stars in the spiral arms of galaxies revolve around galactic cores is more or less constant, regardless of the radius.

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