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Near-Earth objects / Spaceflight / Asteroid-impact avoidance / Asteroids / Arecibo Observatory / Spaceguard / 99942 Apophis / NASA / Space debris / Space / Planetary science / Planetary defense
Date: 2012-06-14 19:41:50
Near-Earth objects
Spaceflight
Asteroid-impact avoidance
Asteroids
Arecibo Observatory
Spaceguard
99942 Apophis
NASA
Space debris
Space
Planetary science
Planetary defense

Status of Planetary Astronomy

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