What is the difference between the observable universe and the whole universe?
Vitthal Nath
Jharkhand, India
About 13.8 billion years ago, the Big Bang kicked off the universe, filling it with matter, dark matter, and dark energy. Since then, the universe has expanded into what we see (and don’t see) today.
Light, the fastest thing in the universe, has a speed limit of about 186,000 miles per second (about 300,000 km/s). This means that, from our viewpoint, we can only see as far as