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
Wall of the Sun and Wall of the Moon "Moon". The two mosaic murals were assembled "in situ" by a team of technicians under the direct supervision of Miró and Llorens Artigas. The works were inaugurated in 1958, as same as the building, and received rave reviews. Even one of the murals, the "Wall of the Sun" won the Biennial Prize of Guggenheim Foundation. Miró later return to work for UNESCO, designing the UNESCO Medal for Pablo Picasso. Initially, the walls were outdoors, but later moved inside the building to protect them from damage caused by acid rain. Wall of the Sun and Wall of the Moon The Wall