39 - Mars Oppositions: 1995-2007 (Relative Positions and Sizes - true colors; credits: NASA/HST)

Caption NASA:"This illustration shows the relative positions of Earth and Mars at the last 7 Martian oppositions from 1995 through 2007. Opposition occurs when the Sun and Mars are on exact opposite sides of Earth, resulting in a full-phase for Mars, similar to a full moon.
The images of Mars show the Planet's apparent relative size at each opposition, as viewed by the Earth-orbiting Hubble Space Telescope.
Orbits of the inner planets are to scale".