Were Globus Cassus a project intended to be implemented, one may possibly encounter insurmountable problems.
Finally, theThe timescales required for construction of such a structure (assuming current technology) would probably be of the order of millions of years.▼
The largest structure that could be built using known materials is no more than two thousand kilometers in diameter, using carbon nanotube fibre. {{Fact|date=October 2007}} A rotating habitat as suggested in the 'Globus Cassus' concept, spun to produce Earth-like gravity, would fall apart if it were more than about 20 kilometers in diameter. {{Fact|date=October 2007}} Furthermore, the tidal forces exerted on the Globus Cassus by the sun and the moon would tear it apart while construction was underway. {{Fact|date=October 2007}}
Being at geostationary orbit, the equatorial regions of Global Cassus would have, in the absence of Earth's mass below, an artificial gravity equal to roughly 2% of normal Earth gravity. {{Fact|date=October 2007}} The same would hold in the archival nodes. Human beings and animals could not survive indefinitely in such microgravity, nor would this be sufficient to sustain a habitable atmospheric pressure. {{Fact|date=October 2007}}
▲Finally, the timescales required for construction of such a structure (assuming current technology) would probably be of the order of millions of years.
