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Asteroids. How We Study Them. Spacecraft Ground-Based and Hubble Imaging Radar Imaging. Spacecraft Images. 951 Gaspra (15 km). 243 Ida (40 km) and Dactyl. 253 Mathilde (50 km). Three Asteroids Compared. 433 Eros (20 km). Eros. Earth-Based Optical Imaging. 4 Vesta (500 km).
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How We Study Them • Spacecraft • Ground-Based and Hubble Imaging • Radar Imaging