Thus, the Local Group of galaxies may be surrounded by an extended corona of gas, whose properties are suggestive of both the most diffuse and the densest regions of the IGM.

• 因此，本星系群（LocalGroupofgalaxies）也许被延伸的气体冕环绕著，其性质则说明它可能既是IGM中最稀薄又是最稠密的区域。