Issued in many varieties such as individual stamps,
individual & combined minisheets, gold foil stamps etc
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Niue also issued at least one other minisheet of 6 stamps commemorating the Stardust spacecraft

On 2006 October 4 Mali issued six minisheets, each with two stamps, featuring a number of subjects including Galileo Galilei, Giolanni Cassini, Christiaan Huygens, Edmond Halley and various spacecraft