What's really crazy is, whichever direction our telescopes peer out 14 or so billion light years into, they are imaging the point in time when the entire universe was millions of times smaller than the head of pin (the Big Bang singularity).
And just to clarify, ONE light year, the *distance* light travels in a year at its basically fixed speed of 186,000 miles per second, works out to just over 5.9 TRILLION miles.
So that's 5.9 trillion (miles) times 14 billion, in EVERY direction, we are "seeing" an almost infinitely tiny speck of space! The beginning of the universe.
Yes, I know what a light year is. It's been seared into my mind since reading sci-fi novels at 13 or so. I'm 67.
And yes, our best telescopes still can't see the end of galaxy/nebula/gases expansion. When and if they can, it will be huge news that they found the last galaxy and the emptiness beyond.
BTW, I've read and heard that the Singularity was the size of a basketball or baseball. You say it was the size of pin head. No wonder the poor thing exploded...haha. Humans will never understand how the Singularity came into being.
I've read a convoluted hypothesis that claims it COULD appear out of nothingness with some reasoning that atoms could appear from the coldness and darkness of space. Something similar how certain chemicals on Earth combined to form single cell lifeforms. I could possibly buy into that life form theory. Just not buying the Singularity spontaneously poofing into existence. How would a neutron, proton (positive charge), electron (negative charge), neutrinos, isotopes, etc, just suddenly appear?
And yes, I've read that your pin head or my baseball Singularity was only made up of hydrogen or helium? atoms, and upon expansion, our known elements were created in a gazillionth of second after the big bang. It all seems to have been directed.