Formation and evolution of the Solar System impact event, the Tunguska event, the Chelyabinsk meteor and the impact feature Meteor Crater in Arizona. The process of accretion, therefore, is not complete, and may still pose a threat to life on Earth. Over the course of the Solar System's evolution, comets were ejected out of the inner Solar System by the gravity of the giant planets, and sent thousands of AU outward to form the Oort cloud, a spherical outer swarm of cometary nuclei at the farthest extent of the Sun's gravitational pull. Eventually, after about 800 million years, the gravitational disruption caused by galactic tides, passing stars
The Moon and the Sun time to complete the special effects work. The Moon and the Sun The Moon and the Sun is a novel by American writer Vonda N. McIntyre, published in 1997. The book combines two major genres: science fiction and historical romance (also known as alternate history). It won the Nebula Award for Best Novel in 1997, beating out "A Game of Thrones" by George R. R. Martin. The novel was inspired by the short story (written in the form of a faux-encyclopedia article) "The Natural History and Extinction of the People of the Sea", also by McIntyre, which was illustrated by