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.
Best Answer: wow, I think there are millions of such questions and you could stick your finger in a large dictionary and use this as a starting point. I was working on the question recently of why all the stars in a galaxy move at the SAME velocity. They do not behave like the planets moving around a star wherein they all travel at different velocities very similar to a water vortex in a bathtub drain where the innermost particles travel at increasingly faster rates.