Humans have great difficulty perceiving the scale of our universe.
Light, in a vacuum, travels 186,282 mph in round numbers. The Sun is an average of 92,955,807.3 (1 astronomical unit, AU) miles from Earth. It takes light 8.3 minutes to get from the Sun to the Earth.
Pluto is 39.3 AU (± 9.6 AU depending where Pluto is in it's inclined orbit) from the Sun. If you were an astronaut at Pluto and radioed NASA a question, it would take 5.5 hours at the speed of light for your question (radio signal) to get to Earth, and 5.5 more hours for NASA's reply to get back to you. 11 hours round trip. (You say - Hi! What's you name? - 11 hours later you hear NASA'a reply- Well hello back. My name is Ken.)
Pluto isn't at the edge of our solar system. Out well beyond Pluto is the Oort Cloud (from 50,000AU to 2 light years), which is thought to be the source of long period comets. Short period comets apparently come from the Kuiper Belt, which Pluto is a part of. The Kuiper Belt starts at Neptune's orbit (30 AU) and extends out to about 50 AU.
Voyager 1, launched in 1977, is about 120 AU from the Sun (about 11,000,000,000 miles) andd has a very long way to go before it leaves our solar system.
Though 1 AU is 92,955,807.3 miles, it's still not a practical unit of measurement for astronomers interested in things outside our solar system, so they use a base unit of measure that is equal to the distance corresponding to a parallax of one second of arc, or 3.6 light years (about 19 trillion miles) that they call a parsec (parallax of one second).
However, space is aptly named, so astronomers speak of interstellar distances in megaparsecs (millions of parsecs). So 1 megaparsec is = to 3,600,000 parsecs, or 19 trillion miles x 1 million.
The next closest star to our Sun is Proxima Centauri. Proxima Centauri is 4.2 light years (1.16 parsecs) from the Sun. Proxima Centauri is 7 times smaller than our Sun and cannot be seen with the naked eye. As far as that goes, out at Pluto, our own Sun will be just a speck, and not even close to being the brightest star in the sky to human eyes. I doubt humans will ever get get as far from Earth as the distance to Pluto's orbit.
