The largest of the four terrestrial planets is Earth. This planet has a diameter of about 12,742 kilometers (7,918 miles) and has a diverse environment with land, water, and atmosphere that supports a wide variety of life forms.
When we refer to terrestrial planets, we are typically talking about Mercury, Venus, Earth, and Mars, all of which are composed primarily of rock and metal and have solid surfaces. Among these, Earth stands out not only because of its size but also due to its unique ability to sustain life.
Comparatively, Mercury is the smallest, followed by Mars, and then Venus, which is similar in size to Earth but still smaller. Earth’s size contributes to its gravitational pull, which helps maintain its atmosphere and sustain various ecosystems.