Most of the asteroids and comets in our solar system do not pose any danger to our planet. But, for every thousand or so of those objects there is one with an orbit crosses that of Earth, posing the possibility of a collision at some future time.
Most of the asteroids and comets in our solar system do not pose any danger to our planet. But, for every thousand or so of those objects there is one with an orbit crosses that of Earth, posing the possibility of a collision at some future time.