* Diameter: Earth's diameter is about 12,742 kilometers (7,926 miles), while Mercury's diameter is only about 4,880 kilometers (3,032 miles). This means Earth is about 2.6 times larger than Mercury in diameter.

* Mass: Earth is about 18 times more massive than Mercury.

* Surface Area: Earth has a surface area of about 510 million square kilometers (197 million square miles), while Mercury's surface area is only about 75 million square kilometers (29 million square miles).

In simpler terms, imagine Earth as a large grapefruit and Mercury as a small orange.