Venus and Earth are called "Sister planets" but if you've noticed Venus is bigger than Earth so therefore Venus is the biggest planet.
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Earth is the largest terrestrial planet in our solar system.
1...Earth
A terrestrial planet is one like Earth, Mercury or Mars, a solid, rocky planet-- not a gas giant like Jupiter. Earth is the largest one in our solar system, however larger planets have been observed outside our solar system that are thought to be terrestrial, such as Gliese 436 c.
There are for terrestrial planets which are also the planets nearest to the sun. The four terrestrial planets are: Mercury, Venus, Earth, and Mars. The least dense planet among the four is Mars.
The terrestrial planets are also known as the inner planets. These are the planets that are closest to the Sun in our solar system and are characterized by their solid, rocky surfaces.