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Application of Seasat's (sea satellite) remote sensing radar to imaging of terrain could bring scientists one step closer to high-resolution pictures of other planets' surfaces. During its short lifetime, Seasat, equipped with synthetic aperture radar (SAR), took pictures of Earth through clouds and at night with a resolution comparable to photography. The Venus Orbiting Imaging Radar (Voir) mission, not yet approved but at the top of NASA's planetary priority list, also is slated to use SAR at a resolution and coverage comparable to the Mariner 9 coverage of Mars. In addition, SAR is expected to be on board the first shuttle flight to carry scientific instruments (the second orbital flight).