to record or make note of something to log a rock that flies through outer space an asteroid the path of an object around a planet an orbit to be in an unknown location to be unaccounted for a kind of light humans can’t see without special glasses infrared dangerous hazardous to follow the movement or progress of something to track to notice to pick up https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf