Israel's strikes zeroed in on Iran's nuclear program. How much damage was done?

By Rob Picheta, CNN (CNN) — Israel's unprecedented attacks on Iran had at their core an elusive and high-risk goal: eradicating the country's controversial nuclear program. Israel targeted three key Iranian nuclear facilities - Natanz, Isfahan and Fordow - and a number of top scientists involved in nuclear research and development. The extent of the damage is beginning to come into view, with satellite imagery and expert analysis hinting that the strikes had a significant impact in at least two of the locations. But much remains unclear - not least because Iran's most sensitive nuclear infrastructure is buried deep underground…