ROFL! You just never stop, do you?
Hint: By the time the comet(s) cross the Earth's orbit in that picture, the Earth will have moved on to somewhere else.
Hint#2: Space, unlike your image, is 3D -- there's a *HUGE* amount of room for orbits to pass over/under each other, even if they look as if they "cross" on a flat plot like yours.
Hint#3: Although the Earth looks quite large on that (OUT OF SCALE) image, it would actually be a nearly invisible pinpoint if drawn to scale -- again, it's a lot easier for things to miss each other in the vastness of space than is implied by your drawing.