Closest view of Kuiper Belt from Earth!

Kuiper belt lies in the outer region of our Solar System. When researchers sent probes like the one sent by NASA by the name of The New Horizon, we discovered that our Solar System is not as big as we think but it is 2x larger in diameter.

Source: deepspaceexplorers.org

This is one of the reason of why Pluto is again included in the 'Happy Family'. Not only this, by the hypothesis, we now know that there are more planets in our system which are far away into the region where there is Kuiper Belt.

Outer edge of Solar System showing heliopause and heliosphere

Credits: helios.gsfc.nasa.gov

Then there lies the regions known as Heliosphere which is:

An enormous expanse marked by the outer reaches of the Sun's magnetic field and solar winds

and Heliopause which is:

A boundary where Sun's solar winds balances with the pressure of Interstellar medium

Let's talk in distances

Kuiper's inner belt is 30 Astronomical Units (AU) and Kuiper's outer edge is 50 AU distant from Sun, where 1 AU is roughly or approximately equal to the distance between the Sun and the Earth which is 150 million km.

The object which was recently observed IN MOTION was located at a distance of approximately 5.3 billions km from Sun. This is what NASA's probe, The New Horizon sent us: