You think the big galaxies in early universe There would have been plenty of «fuel» left for the new stars, but a recent discovery indicates that this was not always the case. Astronomers using the Hubble Space Telescope and the Atacama Large Millimeter/ Submillimeter Array (ALMA) have found Six early galaxies (about 3 billion years after the great explosion) that was unusually «dead» — that is, we ran out of cold hydrogen necessary for star formation. This was the peak period for star births, according to lead researcher Kate Whitaker, so the disappearance of this hydrogen is a mystery.
The team discovered galaxies thanks to powerful gravitational lenses, using galaxy clusters to bend and amplify light from the early universe. Hubble pinpointed where stars formed in the past, while ALMA detected cold dust (a replacement for hydrogen) to show where stars formed if the necessary ingredients were present.
Galaxies are thought to have expanded since then, but not through the creation of stars. Instead, it grew through mergers with small galaxies and other gases. Any formation after that will be limited at most.
The results are a testament to the combined strength of Hubble and ALMA, not to mention the capabilities of Hubble Decades after its release. At the same time, it emphasizes the limitations of both technology and human understanding by asking a number of questions. Whitaker noted that scientists don’t know why galaxies died so quickly, or what happened to cutting off the fuel. Was the gas heated, expelled, or consumed quickly? It may take some time to provide answers, if answers are possible.
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