A vector is a mathematical construct that has magnitude and direction. The cross product of two vectors is a binary operation in three-dimensional space that results in a third vector that is ...
In the present situation, both Earth and Mars are moving in the same direction around the Sun, but the slower one, Mars, appears to move backwards compared to the faster one, Earth. Just an illusion. The retrograde motion of Mars â like the apparent motion of the slower car on the highway â is nothing more than an illusion.
Itâs a riddle thatâs puzzled physicists for well over a century, and theyâve come up with numerous theories to explain timeâs arrow. The latest, though, suggests that while time moves forward in our universe, it may run backwards in another, mirror universe that was created on the âother sideâ of the Big Bang. Two leading theories propose to explain the direction of time by way of the relatively uniform conditions of the Big Bang.