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
Sun and Moon (Middle-earth) name given to the Sun by the Noldor. A poetic name for the Sun was the Daystar, and Gollum referred to it as the Yellow Face. The Sun was seen by the Elves as made on behalf of Men, and they valued the Moon more highly. Morgoth's creatures, the Orcs, feared the Sun, and with the exception of the Uruk-hai, they did not travel while it was in the sky. The Trolls of Middle-earth feared the Sun even more, and with great reason: they turned to stone under its light. Only the later Olog-hai were able to move under the