Astronomers gain a new understanding of the re-ionization of the universe by studying a nearby dwarf ‘green pea’ galaxy. Newly formed dwarf galaxies were likely the reason that the universe heated up about 13 billion years ago. The finding opens an avenue for better understanding the early period of the universe’s 14 billion year history.
In the period of several hundred thousand yrs after the Big Bang, the universe was so hot and dense that matter was ionized instead of being in a neutral form...
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