Earth-crossing asteroid — Asteroid whose path around the Sun crosses Earth s orbit. Three groups of such asteroids Aten, Apollo, and Amor asteroids are distinguished by the size of their orbits and how closely they approach the Sun. The Atens and Apollos cross Earth s… … Universalium
List of Earth-crossing asteroids — An Earth crosser asteroid is a Near Earth asteroid whose orbit crosses that of Earth. The known numbered Earth crossers are listed here. Those Earth crossers whose semi major axes are smaller than Earth s are Aten asteroids; the remaining ones… … Wikipedia
Planet-crossing asteroid survey — Le programme Palomar Planet Crossing Asteroid Survey (PCAS) a été lancé par Eleanor F. Helin et Eugene M. Shoemaker en 1973. Ce programme est à l origine de la découverte de plusieurs milliers d astéroïdes de tous types dont un grand nombre d… … Wikipédia en Français
Planet Crossing Asteroid Survey — Le programme Palomar Planet Crossing Asteroid Survey (PCAS) a été lancé par Eleanor F. Helin et Eugene M. Shoemaker en 1973. Ce programme est à l origine de la découverte de plusieurs milliers d astéroïdes de tous types dont un grand nombre d… … Wikipédia en Français
Planet-Crossing Asteroid Survey — The Palomar Planet Crossing Asteroid Survey (PCAS) was initiated by Eleanor F. Helin and Eugene M. Shoemaker in 1973. This program is responsible for the discovery of several thousand asteroids of all types including a large number of Near Earth… … Wikipedia
Planet-Crossing Asteroid Survey — Le programme Palomar Planet Crossing Asteroid Survey (PCAS) a été lancé par Eleanor F. Helin et Eugene M. Shoemaker en 1973. Ce programme est à l origine de la découverte de plusieurs milliers d astéroïdes de tous types dont un grand nombre d… … Wikipédia en Français
Planet-Crossing Asteroid Survey — Die Palomar Planet Crossing Asteroid Survey (PCAS) wurde im Jahr 1973 von Eleanor F. Helin und Eugene M. Shoemaker ins Leben gerufen. Das Ergebnis des Programms ist die Entdeckung mehrerer tausend Asteroiden aller Typen einschließlich einer… … Deutsch Wikipedia
asteroid — asteroidal, adj. /as teuh royd /, n. 1. Also called minor planet. Astron. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those… … Universalium
earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… … Universalium
Asteroid deflection strategies — are methods by which near Earth objects could be diverted, preventing potentially catastrophic impact events. A sufficiently large impact would cause massive tsunamis and/or, by placing large quantities of dust into the stratosphere blocking… … Wikipedia
