How Far Does Space Go

The observable universe can even be measured.

How far does space go. Practically we can see as far back as the cosmic microwave background. But that is only 380 000 light years away. From afar our galaxy seems dense but in reality the average distance between stars is 47 trillion kilometers.

It contains all the light we will ever be able to see because when we look across space we are mostly looking for light. It is time not space which limits our view. The spacecraft will run out of power around 2025 but where will it travel to first.

It consists of billions of stars gas clouds dark matter black holes neutron stars and planets with a supermassive black hole in the galactic center. By the same token space is often defined as beginning at the lowest altitude at which satellites can maintain orbits for a reasonable time which is approximately 160 kilometers 100 miles above. It is 93 billion light years.

Some people have suggested space may by infinitely large. How far can voyager i go. And it is the youngest because it is a snapshot of our newborn universe long before the first stars and galaxies formed.

This is as far as we can see into the universe. For all practical purposes space ends at the event horizon we call the big bang. If you define it as the limit of what we can observe a signal from who we can see and who can see us then the edge goes out to 46 1 billion light years.

Space is what people normally refer to as 100 kilometers above the surface of the earth.