Could blow up Yavin IV

Several of the giant planet’s numerous moons, however, were planet-sized themselves, and of these, three could support humanoid life. Particularly inviting was the satellite designated by the system’s discoverers as number four. It shone like an emerald in Yavin’s necklace of moons, rich with plant and animal life. But it was not listed among those worlds supporting human settlement. Yavin was located too far from the settled regions of the galaxy.

(...)

Theoretically, no weapon could penetrate the exceptionally dense stone of the ancient temple, but Luke had seen the shattered remains of Alderaan and knew that for those in the incredible battle station the entire moon would present simply another abstract problem in massenergy conversion.

***

Star Wars Trilogy, A New Hope Chapter 11