Question about rocket launches and trajectories.
i saw in a video that the earth orbits the sun at 30km/s and that you'd need to cancel it out to reach the sun with a rocket. i don't understand, after reaching space, why not just steer towards it go straight? or about mars, all the diagrams I've seen launch the rocket while mars is closest to us, why not pre-launch so mars then sortens the distance by itself instead of lengthening it like in the diagram? these are genuine questions from an interested outsider so please forgive me if i sound dumb