Earth is a true sphere but rather a flattened sphere called an oblate spheroid.
The vast majority of Earth's atmosphere is composed of nitrogen.
Earth's rotation is slowing down by 17 milliseconds every 100 years.
70% of Earth's surface is covered by water. The first life on Earth developed in the oceans through abiogenesis
or the evolution of life from non-living matter.
Earth has a strong magnetic field due to its nickel-iron core and fast rotation.
The asteroid 3753 Cruithne is sometimes called Earth's 'second moon' but it actually follows a horseshoe-like orbit around the sun that only
occasionally brings it in close proximity to Earth. Thus, it's said to be co-orbital to Earth.
Earth is the only planet known to have life. A recent study suggests that there may be as many as 1 trillion different species on Earth.
One of the most mysterious places on Earth is the Mariana Trench, the deepest point on the planet's surface.
Shown here are some of the many bizarre creatures that have evolved to survive in the trench's crushing depths and comeplete darkness.
Earth's ecosystems are incredibly diverse:
The same side of the Moon faces the Earth.
The Moon is slowly drifting away from Earth at a rate of 3.8 cm per year. In 50 billion years, the moon will orbit the Earth in 47 days rather than the current 27.3 days.
Only 12 people have visited the Moon, all of them American men.
You would weigh only 16.5% of your Earth weight on the Moon.
The Moon has no atmosphere, which accounts for its huge temperature variations.