TURN up the volume in your new Rolls-Royce Phantom Tranquillity and you'll be touching a piece of outer space - literally.

For this most indulgent version of an already indulgent car, unveiled at the Geneva Motor Show, has references to other worlds in a machine that only 25 very wealthy individuals will be able to buy.

Taking the standard Phantom limousine as its base, the Rolls-Royce designers have aimed "to celebrate the feeling of euphoric tranquillity one achieves within the car", adding that this unique Phantom beautifully curates objects and inspirations from worlds beyond earthly bounds.

Part of the car's design inspired by the X-Ray coded aperture masks used on the British Skylark space rocket. High energy radiation passes over and through the distinctive perforated pattern, creating a coded shadow on the layers beneath. The properties of the original radiation sources were mathematically reconstructed from this shadow and rendered in highly reflective stainless steel, 24-karat gold plating and space grade aluminium.

Space exploration is further manifested with a unique first, says Rolls-Royce; the incorporation of meteorite within the volume controller.

It comes from the Muonionalusta meteorite which fell to earth in Kiruna, Sweden in 1906, and is complemented by detailed engraving of the location and date of its discovery.

A standard Phantom costs from £318,120 but Rolls-Royce is keeping quiet about the cost of this Tranquillity version. Expect it to cost a great deal more.

Power comes from the standard car's 6.7 litre V12 engine, enough to take this big and heavy car to a 149mpg top speed. Hardly rocket speed, but probably fast enough.