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Saturn's Moon Helene
This image was captured by the robotic Cassini spacecraft orbiting Saturn swooped to within two Earth diameters of the diminutive moon. Besides the conventional craters and hills, the image also shows terrain that appears unusually smooth and streaked. Planetary astronomers will be inspecting these detailed images of Helene to glean clues about the origin and evolution of the 30-km across floating iceberg. Helene is also unusual because it circles Saturn just ahead of the large moon Dione, making it one of only four known moons to occupy a gravitational well known as a stable Lagrange point.