And... indeed they are. But the diameters of each of the other planets combined are less than the average distance between the Earth and the Moon:

Average distance from Earth to the Moon:

Approximately 384,400 kilometers.

Diameters of the other planets:

Mercury: 4,880 kilometers

Venus: 12,104 kilometers

Mars: 6,779 kilometers

Jupiter: 139,820 kilometers

Saturn: 116,460 kilometers

Uranus: 50,724 kilometers

Neptune: 49,244 kilometers

For a total of 380,011 km, so 4,000 km to spare!