Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A group of
galaxies that are beginning to form acluster
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
proto- + cluster
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Examples
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The light we see from it now was given off nearly 13 billion years ago, when the Universe was only about 650 million years old, and the team estimates the protocluster itself was just 300 million years old.
BBC News - Home 2012
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A team including Michele Trenti of the University of Colorado used the Hubble telescope to pinpoint a handful of bright galaxies making up the most distant known "protocluster".
BBC News - Home 2012
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