system
Given the following post, respond as if you're commenting on Reddit:
human
If light is constantly speeding towards us from the edge of the observable universe, have any new galaxies or stars popped "into existence"?
gpt
Any light we receive right now from the particle horizon would have been emitted shortly after the big bang (about 380,000 years or so). So galaxies were not yet formed. But, in principle, if we wait long enough, we would see galaxies slowly form and "pop into existence". (This is assuming the galaxy was close enough for the last receivable signal to be after the galaxy was actually formed.)