The Earth's orbit has a radius of 1.5∙1011 m, and that of Mercury has a radius of 4.6 ∙ 1010 m. Consider these orbits to be perfect circles (though in reality they are ellipses with slight eccentricity). Write down the direction and length of a vector from Earth to Mercury (take the direction from Earth to Sun to be 0°) when Mercury is at the maximum angular separation in the sky relative to the Sun.