If you could see all of space at once, it would be an awe-inspiring sight. However, it's important to note that the universe is vast and continually expanding, so the notion of seeing "all of space" is not feasible for a single observer. Nevertheless, I can describe what you would be able to observe if you had an unobstructed view of the observable universe.
The observable universe is the portion of the universe from which light has had enough time to reach us since the Big Bang, given the current age of the universe and the speed of light. It is estimated to have a radius of about 46.5 billion light-years. However, due to the expansion of the universe, the distance between objects has been increasing over time, and some regions that were once observable have moved beyond our current observable horizon.
Assuming you could see the entire observable universe, it would appear as a vast expanse of stars, galaxies, and other celestial objects. You would see galaxies in various shapes and sizes, from small dwarf galaxies to massive spiral and elliptical galaxies. The space between galaxies would not be empty but rather contain diffuse gas, dust, and cosmic structures like filaments and voids.
As you gaze deeper into space, you would also witness more distant and ancient objects. The light from these objects would have traveled vast distances and would provide a glimpse into the early stages of the universe, offering insights into its formation and evolution.
It's worth noting that while the observable universe is extensive, it represents only a fraction of the entire universe. The universe may extend far beyond what we can observe, and there may be regions that are forever beyond our reach due to the expansion of space.
In summary, if you could see all of space at once, you would witness a breathtaking display of galaxies, stars, and cosmic structures spread across a vast expanse. However, due to the limits of the observable universe and the vastness of space, it would not be possible to see the entirety of the universe from a single vantage point.