If Mars comes so close it is as big as the moon in the sky, then THAT means that the direction the planets are moving has changed, which means that the moon would possible be GIGANTIC and the sun, which is the closest and most dangerous planet, would be coming close...and possibly touch Earth, and if not, heating everything and make people die, and make lots of un-living things melt or burn. Probably making Atlantic melt and have normal weather, slowly killing everything there, and melting all of the ice.
That's what it has to do with the current subject of this conversation, relating to the " Mars coming close " part.