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re: Do you accept the notion of the Big Bang as the origin of our universe?
Posted on 1/5/18 at 8:20 pm to DavidTheGnome
Posted on 1/5/18 at 8:20 pm to DavidTheGnome
Below is the oldest galaxy Hubble has ever seen. It dates to just 400 million years after the BB. That means it's now almost 13.4 billion years old. It looks young and fresh because we're seeing it at a young age. It may not even exist now.
That boundary should logically be the BB if we're on the right path of discovery, since our view of Galaxy GN-z11 is in that direction of time.
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The remote galaxy GN-z11, shown in the inset, existed only 400 million years after the Big Bang when the universe was only 3 percent of its current age. It belongs to the first generation of galaxies in the universe, and its discovery provides new insights into the early universe. This is the first time that the distance of an object so far away has been measured from its spectrum, which makes the measurement extremely reliable.
GN-z11 is actually ablaze with bright young blue stars, but these look red in this image because its light was stretched to longer, redder wavelengths by the expansion of the universe.
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To me seeing the early galaxies would mean that we are approaching some sort of boundary of the universe (it would be much further out but still ) because we are seeing the first galaxies.
That boundary should logically be the BB if we're on the right path of discovery, since our view of Galaxy GN-z11 is in that direction of time.
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Posted on 1/5/18 at 9:58 pm to Kentucker
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That boundary should logically be the BB if we're on the right path of discovery, since our view of Galaxy GN-z11 is in that direction of time.
Right. Since that Galaxy is there we can assume more and more of those age galaxies and younger would come into view if enough time had elapsed for the light to travel. That would mean we are approaching the boundary of the universe I would think.
Posted on 1/6/18 at 5:41 pm to Kentucker
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The boundary logically should be the BB
I think you misspoke slightly. You would never actually be able to see the BB itself. For some undetermined amount of time after the BB the entire universe was opaque. It was a sea of individual atoms that were still superheated but did not emit light in the former of photons.
Scientists have pretty much confirmed the BB with the discovery of Cosmic Background Radiation which -simply put- is the leftover heat from the BB.
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