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Well are this 4.000 yotta watts the overall sum of energy produced or is it just the emitted light? Because there are other products from the sun that also create energy, e. g. cosmical winds, magnetic output, heat, radiation of invisible light...Before the sun collapses it will increase its mass and grow (dunno how much but the overall waste of energy it produces will let the sun grow constantly). When it grows then the question is - how long could we use this energy before we burn ourselfs? B…

Black holes emit enough radiation - you can see them clearly on xray filter cameras and you can even measure the radiation. As black holes are massive - more than suns the pressure in it is enormous. Dunno if we can talk of pressure here but at least the gravity is huge - more than those of suns. So there must be something that is usable Except the physics in black holes are totally different and we would need a 2nd Albert Einstein or Newton to form physical laws^^ Anyway the imagination of usi…