WASHINGTON  - Mars and Venus are much further apart than previously thought — and we’re not talking about planets. In research published Wednesday, three European psychologists, using a new model for analysing personality differences between men and women, claimed the gap between the genders has been sorely underestimated in previous studies. “The idea that there are only minor differences between the personality profiles of males and females should be rejected as based on inadequate methodology,” they wrote in the online journal PLoS ONE (www.plosone.org). Led by Marco Del Giudice of Italy’s University of Turin, the researchers took a 1993 survey of 10,000 men and women in the United States and re-crunched the numbers.