Although some of the planets are huge compared to our Earth, most illustrations show them as deceptively large in proportion to astronomical distances.

One of my favourite pieces of information is that all the planets would fit between the Earth and the Moon.

Semi-major axis of the Earth – Moon distance: 384,399 km 

Diameter of Mercury: 4,879 km

Diameter of Venus:12,104 km

Diameter of Mars: 6,779 km

Diameter of Jupiter: 139,822 km

Diameter of Saturn: 116,464 km

Diameter of Uranus: 50,724km

Diameter of Neptune: 49,244 km

The total sum of the planets’ diameters is 380,016 kilometers, having enough space to fit Pluto (2,372 km) and Ceres (950 km) as well.