Mercury, Venus and Mars are all smaller than the Earth.
If the question is referring to the US as in the US of A, then no planet is smaller.
Eris is not a planet; it is a dwarf planet. It is much smaller than Earth.
No known planet is smaller than Mercury since Pluto was reclassified as a Dwarf Planet.
Mercury is smaller than Titan, but Titan is a moon, not a planet.
Mars is the only planet which is both smaller and colder than the Earth.
Jupiter is not a star. It is a planet. However, there are stars that are smaller than the planet Jupiter.
No known planet is smaller than Mercury since Pluto was reclassified as a Dwarf Planet.
Eris is not a planet; it is a dwarf planet. It is much smaller than Earth.
Pluto is the dwarf planet that is smaller than the Earth's moon.
Both Mars and Mercury are smaller than Venus. Pluto is also smaller than Venus, although it is no longer considered a planet.
Yes
Smaller.
none, the moon is smaller than all the other planets in our solar system.