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
East of the Sun (and West of the Moon) East of the Sun (and West of the Moon) "East of the Sun (and West of the Moon)" is a popular song written by Brooks Bowman, an undergraduate member of Princeton University's Class of 1936, for the 1934 production of the Princeton Triangle Club's production of Stags at Bay. It was published in 1934 and soon became a hallmark of the Princeton Tigertones, one of Princeton University's all-male a cappella groups. The standard is also sung by the Princeton Nassoons, Princeton University's oldest a cappella group. "East of the Sun" was first recorded by Hal Kemp for Brunswick Records on