How did Marvin the Martian end up on Earth?

Marvin has a variety of spaceships. His people seem to be engaged in active exploration of the inner solar system, of which Earth is part.

Haredevil Hare (1948) (Marvin's first appearance).

Note the slogan - "Mars to Moon Expeditionary Force"

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The Hasty Hare (1952) - (Marvin's first trip to Earth).

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Hare-Way to the Stars (1958)

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Spaced Out Bunny (1980)

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Another Froggy Evening (1995)

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Marvin the Martian in the Third Dimension (1997)