A participant in the Cosmonautics Day celebration holds a model rocket before its launch from the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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People watch a launch of a model rocket during festivities on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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Participants in the festivities held on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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A model rocket launched during festivities on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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A participant in festivities on Cosmonautics Day prepares a model rocket for launch.

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People watch a launch of a model rocket during festivities on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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People watch a launch of a model rocket during festivities on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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People watch a launch of a model rocket during festivities on Cosmonautics Day on the helicopter landing pad at the Peter and Paul Fortress in St. Petersburg.

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