LYCOS RETRIEVER 
Asteroids: Spacecraft
built 118 days ago
Two of the three types of asteroids are represented by the asteroids that have been explored up close with spacecraft. Mathilde is a dark C-type (brightness enhanced several times to match the other three). Gaspra, Ida, and Eros are S-type asteroids. Mathilde and Eros were visited by NEAR Shoemaker and Gaspra and Ida were visited by Galileo.
Source:
Whew, the boulder just missed colliding with the Cosmic Spacecraft, but suddenly the Cosmic Space Patrol find themselves surrounded by thousands of the deadly asteroids. The Cosmic Space Patrol must act quickly to save their spacecraft and spare their lives. The spacecraft is equipped with photon torpedoes, hyperspace, shields, and flip control.
Source:
Improvements in radar technology make it possible to image small asteroids that pass close to the Earth almost as well as by spacecraft flybys. For more distant asteroids the chief technique used to measure asteroid diameters is radiometry, which compares the brightness of reflected visible sunlight from an asteroid with the brightness of the asteroid's emitted thermal radiation in the infrared. See ... Albedo; Infrared astronomy; Occultation.
Source:
MORE ABOUT
Spacecraft