In 2005 J. Marvin Herndon postulated what he calls whole-earth decompression dynamics, which he describes as a unified theory combining elements of plate tectonics and earth expansion. He suggests that Earth formed from a Jupiter-sized gas giant by catastrophic loss of its gaseous atmosphere with subsequent decompression and expansion of the rocky remnant planet resulting in decompression cracks at continental margins which are filled in by basalts from mid-ocean ridges.

Another present day advocate of an expanding Earth is comics artist Neal Adams, who suggests the Earth is growing and not merely expanding, and proposes his ideas within a "Growing Earth-Growing Universe" Theory. Adams has made video animations that graphically illustrate his hypothesis, in which new mass is manufactured by a hypothesized electron/positron pair production process within the core of the Earth and all celestial bodies