To overcome all this, LeRoy Olson, an engineer at the University of Washington, devised a barrel-shaped structure of metal rings.

ECONOMIST: 20,000 leagues under the sea

One of the key discoveries has been the role Saturn's moons play in maintaining the order and structure of the rings.

BBC: Saturn's beauty and power

Images sent back from the Cassini spacecraft (which has been in orbit around Saturn since 2004) have revealed how the fine structure of the rings is broken up into intricate patterns of thousands of ringlets and gaps.

BBC: Saturn's beauty and power

Once the architectural structure is complete, it will contain 18 separate sections of steel and three communication rings.

CNN: Final pieces hoisted atop 1 World Trade Center

Once the architectural structure is complete, it will be comprised of 18 separate sections of steel and three communication rings.

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