The End

He comes from school with a picture that he draw (i'm going to post it later) and explain it to me:
-This is going to happen in many, many years to come: An asteroid will come and it will hit Mars, and then the asteroid will be directed to Earth...and it will hit us, and that will be the end of Earth!!!!
-David...this is sad...how did you came with this ideea??
-Well...it could happen, right??? They keep on showing on Discovery...