Matter, energy and dark energy all produce curvature in space - time , however.
而事实上,物质 、 能量和暗能量在时空中都会产生弯曲.
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Once the size of the universe is doubled both matter energy and gravitation energy double correspondingly.
当宇宙的尺度加倍,物质和引力能都加倍——这样,零的两倍仍为零.
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