In sum , astronomers widely believe the current energy content of the universe to be roughly 4 percent ordinary ( or “ baryonic ” ) matter , about a tenth of which is seen as stars and gas ; a third dark matter in some unknown form ; and two thirds dark energy , the nature of which is even less understood 总之天文学家普遍相信，现今宇宙能量的4 %为普通（或重子的）物质，其中只有1 / 10才是看得到的星球与气体；宇宙能量的1 / 3是某种未知形式的暗物质； 2 / 3的能量则是我们更不了解的暗能量。
