⁣⁣ ⁣ When an asteroid or comet comes close to Earth we call it a near-Earth object. But how close is close? How do we keep track of them? What can we do to mitigate our risk? We have the answers.⁣⁣⁣ ⁣⁣⁣ Here’s what you need to know about near-Earth objects this #AsteroidDay! ⁣⁣⁣ ⁣⁣⁣ #SolarSystem #NASA #Asteroid #FunFact #NowYouKnow #Science