Look up "high altitude nuclear explosion" on Wikipedia. During the Cuban Missile Crisis US and Russia detonated nuclear weapons in space as a part of the saber-rattling. Think Iran could go that close to the edge and not go over it? Maybe that's how YOU like to live. Not me.
UN chief condemns Palestinian toddler killing, urges calm (Reuters)
from the article: Ex-U.S. diplomat: Israel unlikely to strike Iran nuclear plant