Mars' History Is A Fluid Situation. Top 10 Ways to Stop an Asteroid. Les astéroïdes. Le système solaire n’est pas uniquement constitué de planètes et de satellites. Il contient également une multitude de corps de dimension plus réduite, astéroïdes et comètes, ainsi que des petites particules appelées météoroïdes. Ce qui distingue les deux premiers groupes n’est pas la taille, mais plutôt la distance au Soleil et la composition.
Les astéroïdes se trouvent à l’intérieur de l’orbite de Jupiter et sont formés de roches, alors que les comètes se trouvent généralement dans des régions beaucoup plus reculées et sont constituées de glaces et de poussières. L’astéroïde Ida et son satellite Dactyl, photographiés en 1994 par la sonde Galileo d’une distance de 10 870 kilomètres. Ida (à gauche) est membre de la ceinture d’astéroïdes entre Mars et Jupiter. Les astéroïdes En 1801, l’astronome sicilien Guiseppe Piazzi découvrit un astre inconnu qui se déplaçait dans le ciel et devait donc faire partie du système solaire. L’origine des astéroïdes : la résonance Hors de la ceinture. Lincoln Laboratory: LINEAR. Mission Lincoln Near Earth Asteroid Research (LINEAR) is an MIT Lincoln Laboratory program funded by the United States Air Force and NASA.
The goal of LINEAR is to demonstrate the application of technology originally developed for the surveillance of Earth orbiting satellites, to the problem of detecting and cataloging near-Earth asteroids—also referred to as near-Earth objects (NEOs)—that threaten the Earth. Data Collection Method The project uses a pair of Ground-based Electro-Optical Deep Space Surveillance (GEODSS) telescopes at Lincoln Laboratory's Experimental Test Site (ETS) at the White Sands Missile Range in Socorro, New Mexico. The telescopes are equipped with Laboratory-developed charge-coupled device (CCD) electro-optical detectors and collected data is processed onsite to generate observations. LINEAR Observations, Detections, and New Discoveries Naming Minor Planets—The Ceres Connection All minor planets named in the Ceres Connection program have been discovered by LINEAR. INCOMING! Asteroid to Narrowly Miss Earth on Monday.
This may sound like late notice, but astronomers have just spotted a rather chunky asteroid heading our way, set to narrowly miss us on Monday. In fact, it will be such a narrow miss that astronomers in the Southern Hemisphere should be able to spot the flyby with fairly modest telescopes. ANIMATIONS: Watch 2011 MD zip past the Earth in this series of animations. Coincidentally, I was watching yet another re-run of Armageddon the other night when the heroic Bruce Willis and his motley crew of oil drillers-turned-astronauts saved Earth from certain asteroid doom.
On arrival at the asteroid, and having sacrificed many of the team, Willis et al. succeeded in dropping a typical Hollywood-style uber-bomb into the depths of the incoming asteroid and blew it to bits, giving everyone on Earth a glitzy meteor shower. I'm not so sure it will be really that easy to destroy an incoming asteroid (see my previous Discovery News article "How do we dodge the next incoming asteroid? ")