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One cubic zettametre—approximate volume of whole Milky Way including Globes ~5 × 10 68: Volume of the Local Group: 6.7 × 10 71: Volume of the Gemini Void: 1 × 10 72: One cubic yottametre: 1.2 × 10 72: Volume of the Local Void (about 1.4 × 10 24 cubic light years) [24] 3.5 × 10 72: Volume of the Virgo Supercluster [25] 1 × 10 73
TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion.The ton of TNT is a unit of energy defined by convention to be 4.184 gigajoules (1 gigacalorie), [1] which is the approximate energy released in the detonation of a metric ton (1,000 kilograms) of TNT.