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In a recent article in this journal,Paolo Sudiro (2014) considered the long history of the expanding Earth theoryand its recent descent into what he termed “pseudoscientific belief”. Theexpanding Earth theory contends that the radius of the Earth was onceone-half to two-thirds of its current value, with the Earth's continentsforming a continuous sialic cover over the Earth. The theory has had two mainvariants: slow expansion at about 0.5 mm yr−1 radial increase sincethe time of Earth's formation and fast expansion at about 5 mm yr−1since the Triassic. Focusing on Maxlow's model, Sudiro thoroughly addressesthe possibly insurmountable difficulties of the fast version, such as animprobably high density and surface gravity prior to 200 Ma. He omits,however, any discussion of the slow expansion model, which has a longerhistory and far fewer theoretical difficulties. Moreover, recent evidencefrom space geodesy, gravimetry and seismology indicates that the Earth atpresent may be slowly expanding at 0.1–0.4 mm yr−1. It is concludedthat Sudiro's obituary of the expanding Earth theory as a whole mustbe considered premature at this time

history of geo- and space sciences

Indications from space geodesy, gravimetry and seismology for slow Earth expansion at present – comment on “The Earth expansion theory and its transition from scientific hypothesis to pseudoscientific belief” by Sudiro (2014)