Expanding Earth

[[File:Growing earth.gif|thumb|right|165px|A growing Earth.]]{{pseudoastronomy}}
The '''Expanding Earth''' hypothesis, first proposed by Robert Mantovani in 1889, attempts to explain [[continental drift]], but without the actual continental drift.

This hypothesis was actually considered not unreasonable before the acceptance of [[plate tectonics]], and there have been a small number of older respectable [[geologist]]s who held it plausible. It defied [[physics]], but the [[geologist]]s had been right and physics and [[chemistry]] wrong in the 19<sup>th</sup> century regarding the [[age of the Earth]], and the geologists still had a great big smug on. These days, though, it's [[crank]]s [[infinite regress|all the way down]].

==The idea==
The [[hypothesis]] posits that the [[Earth]] is growing as a result of the expansion of the seafloor. According to its proponents, an "expanding Earth" model explains why the outlines of continents that were separated by [[continental drift]] do not quite match up (most people cite {{wpl|erosion}} as the major cause of this). If the Earth were, say, 20% smaller, it is claimed that [[South America]] and [[Africa]] would fit together like pieces in a jigsaw puzzle.<ref>"[https://www.science-frontiers.com/sf037/sf037p11.htm The Earth is expanding and we don't know why]" - ''Science Frontiers Online''</ref>

There are several versions of the hypothesis, from one that claims that the Earth's [[mass (physics)|mass]] has remained constant (and surface [[gravity]] has therefore decreased), to another that holds that the Earth's mass has increased (where the extra mass came from is ''completely'' unaccounted for), to yet another that holds that the gravitational constant of the [[Universe]] has changed.

==Problems with the hypothesis==
As mentioned above, the idea of an expanding Earth has several problems and very little evidence to back it up. For instance, in continental drift theory, we have measurements of the rate of plate movement (done by fancy satellites and lasers) that show the speed of movement. This movement, projected back, gives us the last time the continents were together. That these figures match up with geological strata and the [[fossil record]] is another big hint that we have this right. 

Although some observations that lead to continental drift can also — by a stretch of the imagination — be explained by an expanding Earth, no positive evidence exists that the Earth is expanding. The issue as to whether the Earth has increased in mass (and where it came from) if gravity changed (and how) and if the Earth's density is altering are still issues that the expanding-Earth idea fails to address. How the concept fits in with the development of the [[Solar System]] is also unknown, as presumably other [[planet]]s and moons would also undergo expansion if it was possible; alternatively, one would need to explain why the Earth, and only the Earth, expands. If, at some point of the past, the radius of the Earth had been 50% of its current value, gravity force would be in the order of 39m/s², a value that would crush most humans, let alone bigger creatures like [[dinosaurs]]. Also, Earth density would work out at 44 kg/l, a value far exceeding that of the most dense materials on the planet. Modification of the gravity constants would have equally catastrophic effects, related to the orbit of the Earth around the Sun.

The "theory" also utterly fails to explain places where plates are crashing into each other &mdash; most notably, the creation of the Alps and the Himalayas due to the African and Indian plates, respectively, moving north and encountering the (relatively) immovable object of Eurasia.

==Present-day advocates==
The most prominent current advocate was superhero comics artist {{wpl|Neal Adams||,}} who was otherwise a sound enough fellow and did ''great'' comics but [[Inverse stopped clock|had just this little bit of batshittery]]. He posited new mass being created by [[electron]]-positron pair production in the core of the Earth, stating that the pair production's positron can somehow become protons, making hydrogen atoms in the process. One of the greatest flaws in his argument was his belief that science is either deliberately deceiving the public or that the entire system of science is wrong and that it must change to adhere to his "theory" (actually nothing more than speculation without evidence).<ref>[https://web.archive.org/web/20060318022441/http://wired-vig.wired.com/wired/archive/9.03/adams.html Wired 9.03: Master of the Universe]</ref>

There is apparently a group called the Growing Earth Consortium.<ref>[https://web.archive.org/web/20061130172752/http://www.michaelnetzer.com/gu/ Growing Earth Consortium]</ref>

==Contracting Earth==
In contrast, James Dwight Dana proposed a theory that mountains and other features in the earth's crust were caused by the earth cooling and shrinking, resulting in mountains rising up as the surface crumpled. This has been superseded by plate tectonics to explain the creation of mountain ranges;<ref>"[https://web.archive.org/web/20031120132032/http://www.bbm.me.uk/portsdown/PH_061_History_a.htm The History of Continental Drift] - Before Wegener"</ref> however, it has its [[Stopped clock|grain of truth]] as both [[Mercury_(planet)|Mercury]] and the {{wpl|Moon#Surface_geology|Moon}} present wrinkle ridges and lobate scarps, that suggest both worlds contracted when their interiors cooled even if just a few kilometers at best.

==See also==
*[[Flat Earth]]
*[[Hollow Earth]]
*[[Stellar metamorphosis]]

==External links==
*[http://www.expanding-earth.org/ Expanding Earth Homepage]
*[http://www.youtube.com/watch?v=VjgidAICoQI Video explaining the expanding Earth theory]

==References==
{{reflist}}

[[category:Pseudoscience]][[category:Silly "Earth" theories]]

Categories: Pseudoscience, Silly "Earth" theories