False-color Hubble Space Telescope image of a massive, distant galaxy cluster. Thousands of galaxies, each similar to our Milky Way, are visible. This cluster's existence challenges current cosmological models due to its age and mass, suggesting the Universe may be less massive than previously thought.

Astronomy Picture from 21/08/1998

A Massive Cluster In A Young Universe

Source: https://apod.nasa.gov/apod/ap980821.html


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