- Evidence of Interplanetary Forces: Mars’s Influence on VenusPDF: Context: It is hypothesized that a fifth force of nature can be observed as interplanetary forces. Here, we look at potential evidence that Mars acts on Venus according to the expression when Mars-Venus distance is less than both Mars-Sun and Mars-Earth distances; C is some positive constant; is Venus’s latitude from Mars; T and… Read more: Evidence of Interplanetary Forces: Mars’s Influence on Venus