A high-tech railgun at this point would make more sense than a conventional cannon and is the likely answer.
Satellite imagery has revealed two unusually large artillery pieces, measuring about 80 ft and 110 ft respectively, at a test centre for armour and artillery northwest of Baotou in China.
The two pieces, which are horizontally mounted, are mounted on a concrete pad that appeared between September 2010 and December 2011, when the two pieces were first captured by satellite imagery. Images provided by Astrium confirmed that the objects were still in place in July 2013. Continue reading