1. The problem statement, all variables and given/known data The orbits of the planets remains extremely stable over long times however this not always true for comets. Can you explain why not? What hazards might they encounter during their travels? 2. Relevant equations None 3. The attempt at a solution I think that due to the comet's not having a determined orbit while the comet is traveling it gets affected by multiple gravitational forces so its path is changed and it might crash into another object.