The threat of centaur solar system objects for the Earth
(PHYSorg.com Space & Earth)

Astrophysicists Mattia Galiazzo and Rudolf Dvorak from the University of Vienna, in collaboration with Elizabeth A. Silber (Brown University, U.S.) investigated the long-term path development of centaurs, solar system minor bodies that originally have orbits between Jupiter and Neptune. The researchers have estimated the number of close encounters and impacts with the terrestrial planets after the so-called Late Heavy Bombardment about 3.8 billion years ago, as well as the possible sizes of craters that occur after a collision with the Earth and the other terrestrial planets. The report is published in Monthly Notices of the Royal Astronomical Society.