But in the vacuum of space the tiny amount of air trapped between them would inflate to create a semi-rigid structure.

BBC: Sticking solar power station where the Sun shines

RA-180 will all be contained within the cigar-shaped rigid structure, which will be powered by four propellers and have a top speed of 150kph.

ECONOMIST: Pushing the envelope

It is hard to find a piece of free verse that outshines a well-executed traditional Shakespearian sonnet, despite the later conforming to a rigid structure of 14 iambic pentameter lines and a strict rhyme scheme.

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Other rules constraining law firm structure, such as rigid rules on conflicts of interest and restrictions on cross-border practice, may also fall.

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