Earth

With an equatorial diameter of 7,926 miles (12,756 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet in our solar system.

It's the only place we know of inhabited by living things.

It takes 365.25 days to complete one trip around the Sun.

When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun.

Earth is the only planet in our solar system with only one moon.

Some moons are bits of rock that were captured by a planet's gravity, but our Moon is likely the result of a collision billions of years ago.

Near the surface, Earth has an atmosphere that consists of 78% nitrogen, 21% oxygen, and 1% other gases such as argon, carbon dioxide, and neon.

As Earth orbits the Sun, it completes one rotation every 23.9 hours.

Earth's global ocean, which covers about 71% of the planet's surface, has an average depth of about 2.3 miles (3.6 kilometers) and contains 97% of Earth's water.

This tilt causes our yearly cycle of seasons.

The third planet from the Sun and the only known world to harbor life, with liquid water covering most of its surface and a nitrogen-oxygen atmosphere that shields the surface and supports the biosphere.

From an average distance of 93 million miles (150 million kilometers), Earth is exactly one astronomical unit away from the Sun because one astronomical unit (abbreviated as AU), is the distance from the Sun to Earth.

Titan is the only place besides Earth known to have liquids on its surface.

With a radius of 43,440.7 miles (69,911 kilometers), Jupiter is 11 times wider than Earth.

It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing?" The name Terra TERR-ə is occasionally used in scientific writing; it also sees use in science fiction to distinguish humanity's inhabited planet from others, while in poetry Tellus TELL-əs has been used to denote personification of the Earth.

Earth is the third planet from the Sun and the only astronomical object known to harbor life.