Containing at least 100 galaxy groups, the Virgo Supercluster is a colossal network of around 45,000 galaxies all being pulled by a gravitational force. 

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The largest and most significant member of the Virgo Supercluster is called the Virgo Cluster, which is located near the center. The Local Group, on the other hand, is located in the outskirts of the supercluster. 

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The space between galaxies is known as the intergalactic medium. It is made of hot gases that reach up to 1 million Kelvin. They emit X-rays which can be detected by our x-ray telescopes.