just how big?

Earth vs Neutron star

True scale
ENLARGED ×221
01
Earth12,740 kmMean diameter
02
Neutron star20 kmDiameter
Inset ×221Neutron star is too small to see clearly at this scale. The ring marks its position; only the inset is enlarged.

The mean diameter of Earth is about 637 times the diameter of Neutron star.