An improved quantification of the intergalactic medium and cosmic filaments - Phys.org

Much of the mass in the universe lies not in stars or galaxies, but in the space between them, known as the intergalactic medium. It is warm and even hot, and is called the "warm-hot intergalactic medium," or WHIM. It holds about 50% of the normal mass (vAds Links by Easy Branches
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