It passed by the Earth in February 2005 and then Venus in October 2006 and in October 2007 .
In order to correct the speed of the satellite it undertook several gravitational slingshot flybys of Earth , Venus and Mercury .
Mercury passed by the Earth in February 2005 and then Venus in October 2006 and in October 2007 .
In order to correct the speed of the satellite it undertook several gravitational slingshot flybys of Earth , Venus and Mercury .