Whether or not the asteroid Bennu hits earth on September 22, 2135, it's only a matter of time before a damaging celestial object slams into earth with disastrous consequences, writes Don Lincoln. It's best to take precautions


원문출처 : https://www.cnn.com/2018/03/22/opinions/only-117-years-till-this-asteroid-hits-us-lincoln/index.html