Though we can't feel it, Earth zooms through its orbit at an average velocity of 18.5 miles a second.
Since our calendar years have only 365 days, we add an extra leap day every four years to account for the difference. Our dance around the sunĮarth orbits the sun once every 365.25 days.
Find out the origins of our home planet and some of the key ingredients that help make this blue speck in space a unique global ecosystem. Earth is the only planet known to maintain life.
