This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Mariner was the first spacecraft to make use of an interplanetary gravitational slingshot maneuver using Venus to bend its flight path and bring its perihelion repeatedly down to the level of Mercury's orbit. The spacecraft flew past Mercury three times. Illustration from . Credit NASA Hodges Mariner was the first spacecraft to