Sent_en: 2zh Evidence of the clouds had been previously detected around our own galaxy and in the Local Group, but the temperature range (a few hundred thousand to a million degrees Celsius) and low density have prevented detection outside the immediate neighborhood of galaxies and the reliable estimation of baryon density for the entire universe.
Sent_yy: 在我们自己的星系和本地局域群中，先前已经发现了云存在的证据。但是温度范围（几十万到一百万摄氏度）和低密度阻碍了在星系邻近区域之外的探测和对整个宇宙重子密度的可靠估计。