Europa: 1561 km radius
Earth: 6371 km radius
The diameter is twice the radius.
The length of the Moon's diameter is about 27% of the Earth's.
Earth is small compared to Neptune
The diameter of Uranus is approximately three times that of the Earth.
The Sun's diameter is about 108 times the size of Earth's. (The Sun has a diameter of about 865,000 miles compared to Earth at 8000 miles.)
The Sun's diameter is about 109 times the Earth's diameter.
Pluto is very small compared to earth as earth is compared to the sun.
Saturn is one of the gassy planets and is huge compared to the size of Earth. Saturn has a diameter of 120,536km much bigger than Earth. Earth, however only has a diameter of 12,756km. If you were smart enough you would work out Saturn is 9.45 x Earth.
Mars is only about half the diameter of Earth.
The diameter of Venus is about 95% of the diameter of the Earth. Venus is 12103.6 kilometers in diameter from any reference. (Its slow spin does not produce a bulge.) Earth has an equatorial diameter of about 12756.2 kilometers and a polar diameter of about 12713.6 kilometers.
Jupiter is the largest planet in the solar system and its diameter is 142,984 kilometres compared to Earth's which is 12,756 kilometres.
Uranus is several times larger than the Earth. Its diameter is 29297 miles, compared to the Earth's diameter of 8000 miles
Io is smaller than the Earth, around 3660km in diameter compared with Earths diameter of around 12750km.