Moon - Hansteen & Billy craters

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Hansteen is a lunar impact crater situated near the southwest edge of Oceanus Procellarum. Southeast of it lies the flooded crater Billy, while to the southeast rises Mons Hansteen, or Hansteen Alpha (α), a roughly triangular feature about 30 kilometers across the mare. This volcanic extrusion is younger than the Hansteen crater and parallels the southwestern outer wall of Rima Hansteen, a brief rille approximately 25 kilometers in length.