This new NASA animation shows the dramatic increase of near-Earth objects. See how many asteroids and comets have come close to Earth in the past 20 years. https://cnn.it/2AiblXQ | CNN

A NEO, or near-Earth object, are mostly rocky asteroids that orbit between the Sun and Jupiter. If the object crosses Earth’s orbit and as larger than 140m across, it is considered a potentially hazardous object. Despite having discovered over 34,000 near-Earth asteroids, none are expected to collide within our planet within the next 100 years. | Te Whatu Stardome