Mars Express radar to be deployed in May   Mars Express in orbit around Mars with the MARSIS antenna unfurled   MARSIS main antenna during Mars Express payload tests. One of the two main radar booms is shown here, a 20-metre long hollow cylinder, of 2.5 centimetres diameter, folded up in a box like a concertina (accordion). When the box is opened, the elastic energy of the compressed glass-fibre booms will let them unfold like a jack-in-the-box. Release date: 16 June 2005