New Delhi, March 11 -- How long will the Iran war last? What do all sides want to achieve? And how high will oil prices go? Big questions remain as fighting enters week two.

Israel and the United States keep pounding Iran. And Iran keeps carrying out retaliatory attacks against Israel, U.S. military assets in the Middle East and its Arab neighbors.

Here's what we know about the war, and don't.

How long will the war last?

The U.S. and Israel attacked Iran on Feb. 28, and there is no sign of the fighting ending soon. Iran's president has said mediation was underway, although he didn't give details.

Iran's new supreme leader is the son of the previous one and seen as more hard-line, with close ties to the Revolutionary Guard, the nation...