The oldest known galaxy in existence remains GN-z11, which formed around 400 million years after the Big Bang, as previously reported by Live Science's sister site Space.com. Researchers discovered the ancient galaxy after finding a photo of it in the ALMA archive.

What is the oldest galaxy called?

If the data is confirmed by future observations, HD1 would supplant one called GN-z11 as the earliest-known galaxy by about 100 million years. HD1 would be considered the earliest and furthest known astronomical entity.

What came first galaxy or universe?

Using several different telescopes, astronomers have discovered a distant galaxy whose stars appear to have formed 200 million years after the Big Bang, the explosive event that brought the universe into being. That's about 300 million years earlier than the oldest previously known galaxies.