Today Voyager 1 is approximately 122 AU distance from the Sun. What does the sun look like from this distance? How much brighter does the sun appear to the naked eye compared to other stars in the same field of view? Are any of the other planets from our solar system visible to the naked eye at this distance? Would the sun produce enough light for a normal person to read a book, or would the light be too dark for reading (just trying to get a practical feel of the amount of light)?
Light luminosity follows the inverse square rule. Pluto is approximately 40 AU (on average) from the sun. The sun appears as a very bright star from Pluto with the luminosity of approximately that of the full moon on Earth. The illumination from the moon on a night with a full moon will barely allow the average person to read a book. Since Voyager 1 is currently about 120 AU from the sun. This is three times as far as the average distance of Pluto from the sun. The light would be nine times dimmer than that from Pluto. The sun would look like one of the brighter stars in the sky such as that from Vega or Sirius. However, the unaided eye would probably be unable to read a book and I doubt that the light would be luminous enough to even cast a shadow that you could see.....
