The solar system is almost entirely empty space. This is accurate in both sizes and distances. Drag to pan; scroll to zoom. At full zoom-out, the Sun is barely a dot and Neptune is at the right edge.
Hover over a planet to see details
1 AU = 149.6 million km. Neptune orbits at 30 AU — light takes 4 hours to get there. If the Sun were a basketball (24 cm), Earth would be a 2 mm bead 26 meters away. The nearest star would be 7,000 km away from that basketball.