BARCELONA (AP) — Iran is boasting that it has hypersonic missiles and says it already has begun firing the cutting-edge weapons at Israel.There is no evidence that Iran has unleashed the missiles, and experts are skeptical of the claim.But the use of these fast-moving projectiles could test Israel’s vaunted missile-defense system and alter the course of the fighting between the two bitter enemies.Here’s a closer look at these advanced weapons:What is a hypersonic missile and what makes them so feared?Iran’s paramilitary Revolutionary Guard claimed Wednesday that it had fired what it said were hypersonic “Fattah 1” missiles toward Israel. But...