asteroid - small, planet-like rocky world, Giuseppe Piazzi - Italian astronomer that discovered Ceres, an asteroid, planetesimals - small body from which a planet originated in the early stages of development of the solar system, asteroid belt - the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found, reflectance spectra - used to classify asteroids based on how well they will reflect different wavelengths of light, C-type asteroid - very dark asteroid with no strong absorption features; most "c"ommon, dark like "coal", S-type asteroid - An asteroid that contains mostly silicate rock (olivine) and is typically more reflective than c-type; lightly reddish , M-type asteroid - one of a class of asteroids that have reflectance spectra like those of metallic iron and nickel; "M"-type = "M"etallic, ecliptic - plane out in space where Earth's orbit lies around the sun, Near-Earth objects (NEOs) - asteroids that have orbits that cross Earth's orbit, Apollo objects - Most dangerous NEOs; can hit Earth and cause utter devastation; their orbits cross that of Earth, Chelyabinsk meteor - Apollo asteroid that entered Earth's atmosphere over Russia on February 15, 2013, Trojan asteroid - asteroids that share Jupiter's orbit, Centaurs - outer solar system bodies having an orbit within the region of space of the four outer planets; characteristics of both asteroids and comets,

Asteroids: Origin and Properties

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