Mars formed earlier than did Jupiter. Mars formed later than all the other planets. None of the above. All planets travel along their orbits in the same direction. Planetary orbits are nearly circular.
All planetary orbits lie in almost the same plane.
Comets are very old, mostly made of icy materials, and they move on the same plane as the planets. All of the above. None of the above. None of the above. Mars can be seen at midnight while Venus can't.