Near-Earth asteroid
Near-Earth asteroids (NEAs) are asteroids whose orbits are close to Earth's orbit. A few tens of thousands have been found. Sometimes one crashes into earth. We try to find out if any are going to hit Earth using Asteroid impact prediction. Two near-Earth asteroids have been visited by spacecraft: 433 Eros, by NASA's Near Earth Asteroid Rendezvous probe and 25143 Itokawa, by the JAXA Hayabusa mission.
Near-Earth Asteroid Media
Potentially Hazardous Asteroids 2013
1910 drawing of the path of Halley's Comet
The near Earth asteroid 433 Eros was visited by a probe in the 1990s
Asteroid 4179 Toutatis is a potentially hazardous object that passed within 4 lunar distances in September 2004 and currently has a minimum possible distance of 2.5 lunar distances.
Radar image of asteroid 290751950 DA
NEOWISE – first four years of data starting in December 2013 (animated; April 20, 2018) 
Near-Earth asteroids discovered by size, 1998–2018
All known Near Earth Asteroids (NEA), cumulative discoveries over time
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