system
Given the following post, respond as if you're commenting on Reddit:
human
If our observable universe is only the light cone back to the Big Bang, is it reasonable to assume that there is an entire in observable portion of the universe that was ejected in the opposite direction?
gpt
> observable portion of the universe that was ejected in the opposite direction?

Well, nothing was 'ejected' from the big bang. It's simply an expansion of space, probably from a singularity. Nevertheless, your intuition is right. When we look further away, we are really looking back in time. The further you look back, the younger the universe is. You'll eventually hit a point where the universe was a hot dense plasma that wasn't exactly transparent. The moment where this plasma 'froze out' into atomic matter is the furthest point we can see to in the universe. 

This is called the Surface of Last Scattering, and it released the Cosmic Background Radiation into the universe, which has since been redshfited into very long microwave wavelengths. Since we can look in any direction to see back in time, you'll see that we really at the center of a sort of onion, where each shell is at a certain time before us, and as you go further away, the shells get older and older, until you hit the Cosmic Background Radiation. Since the CBR is opaque, it forms a shell around the observable universe at the 300,000 year old mark, which is about 45 billion light years away. 

As of right now, we cannot see past the CBR, but where we see the CBR today you can bet there are almost certainly other galaxy clusters, galaxies, stars, and planets much like our own local group, Milky Way, sun, and solar system. 


TLDR: Yes, and the explanation is far too cool to boil down to once sentence, so just read the post.