Death Star
The Death Star is a moon-sized battle station, with a primary weapon (superlaser) capable of destroying a planetary shield and then proceeding to destroy the actual planet itself. It is described as having the power to destroy any habitable planet, and this claim was further substantiated by its use against the planet of Alderaan.
Calculations
The Death Star's main superlaser is shown in to be capable of destroying an entire planet. This feat requires, at the absolute minimum, that the gravitational binding energy of the planet be overcome by the power of the weapon. Further, a sufficiently higher quantity of energy must be added to ensure the pieces go far apart enough that they do not coalesce again. Finally, observation of the destruction of Alderaan shows that the planet explodes violently - at a significant fraction of 'c'.
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Specifications
Death Star I
Diameter: 160km
Power Generation: HyperMatter Energy Core
Weapons:
Recharge-Time:
Other Abilities:
Death Star II
Diameter: 900km
Power Generation: HyperMatter Energy Core
Weapons:
Recharge-Time:
Other Abilities: