title: Asteroids as a factor of threat to civilization
abstract: Cover (front and back) SOLAR SYSTEM showing the Sun, the planets, the main belt of asteroids and the orbit of a typical comet (drawing not to scale). The planets are, counting from the Sun: Mercury, Venus, Earth, Mars (to the left), the giant planet Jupiter (to the right) and Saturn (top left, back cover). The comet, coming from the far reaches of the Solar System, is shown in two positions along its orbit. The comet's tail always points directly away from the Sun. The belt of asteroids contains
journal: Visnik Nacional noi academii nauk Ukrai ni