The location of nearly half of the ordinary matter in the Universe is unknown. X-ray observations suggest that this elusive ‘baryonic’ matter is hidden in the filamentary structure of the cosmic web. The location of nearly half of the ordinary matter in the Universe is unknown. X-ray observations suggest that this elusive ‘baryonic’ matter is hidden in the filamentary structure of the cosmic web.

中文翻译：

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在宇宙网中发现的缺失物质

宇宙中近一半的普通物质的位置是未知的。X 射线观测表明，这种难以捉摸的“重子”物质隐藏在宇宙网的丝状结构中。宇宙中近一半的普通物质的位置是未知的。X 射线观测表明，这种难以捉摸的“重子”物质隐藏在宇宙网的丝状结构中。