I just dont even know where to begin. I'm not sure what formulas to use and just can't do anyhting with it. any help would be great. Thanks! Recall that your trip to Mars is accomplished by using an elliptic transfer orbit going from Earth to Mars as shown in Fig. 1. This trajectory assumes that Earth at departure, the Sun, and Mars at arrival, are aligned. You calculated that the semi-major axis for this transfer orbit was a= 190100208000 m. How long, in days, would the interplanetary trip last? Hint: first, determine the period of the transfer orbit.