If our solar system was reduce in size to a CD the Milky Way Galaxy would be the size of the Earth.
No worries though, if we achieve spaceflight within a few decimal points of the speed of light we could circumnavigate the known Universe in 56 years. Unfortunately, when we return home the Sun will be a white dwarf and our Earth a small cindered rock 10s of billions of years in the future.
The famous picture of the Pale Blue Dot (above) is exquisitely commented on by Carl Sagan.
