Matching Pairs ATEROIDSOnline version B2 UPPER INTERMEDIATE by MIRYAM AIMEE PEREZ SANTIAGO 1 to track 2 infrared 3 an asteroid 4 to be unaccounted for 5 hazardous 6 to pick up 7 an orbit 8 to log a rock that flies through outer space to follow the movement or progress of something a kind of light humans can’t see without special glasses dangerous the path of an object around a planet to be in an unknown location to record or make note of something to notice