What age range did the Hubble Ultra Deep Field (HUDF) reveal galaxies existing after the Big Bang?
Answer
400 to 800 million years after the Big Bang.
The Hubble Ultra Deep Field (HUDF), achieved in 2004 after installing the Advanced Camera for Surveys (ACS), marked a significant leap in depth compared to the initial HDF. The HUDF successfully captured light from galaxies that formed very early in the universe's history. Specifically, this image provided views of galaxies as they existed only 400 to 800 million years after the Big Bang occurred. This era is crucial as it represents the time when the universe was recovering from its initial 'dark ages,' and the very first generations of stars and large structures were beginning to light up the cosmos, leading to the observation of an estimated 10,000 galaxies within that tiny field.
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