Bob the Alien's Tour of the Solar System
Earth Why is there life on Earth? How did Earth form? A Year on Earth Earth's Visitors from Space Satellites orbiting Earth 10 Facts about Earth

Ten Facts about Earth

Water as solid, liquid and gas
Water as solid, liquid and gas on Earth

Fact One

Earth is the only planet in the Solar System to have water in its three states of matter: as a solid (ice), a liquid (sea, rain, etc.) and as a gas (clouds). These are all shown below. Water is, of course, the most important liquid for life.

Fact Two

Earth is almost five billion years old, although life (resembling life as we know it) has only existed on the planet for the last 150 million to 200 million years. This means that life has only been present on Earth for only 5%-10% of its lifetime.

Fact Three

Earth and Mercury are the two most dense planets in the Solar System. This means that particles inside the planet are most closely packed together.

Fact Four

The length of time it takes for Earth to orbit the Sun is 365 and a quarter days. To make up this extra quarter which isn't counted at the end of a year, we have an extra day every four years on 29th February. The next Leap Year will be in 2012.

Fact Five

Earth is gradually slowing down. Every few years, an extra second is added to make up for lost time. Millions of years ago, a day on Earth will have been 20 hours long. It is believed that, in millions of years time, a day on Earth will be 27 hours long.

Fact Six

The centre of the Earth, its core, is molten. This means that it is liquid rock which sometimes erupts onto the surface through volcanic eruptions. This core is 7,500°c, hotter than the surface of the Sun!

Fact Seven

Earth is the only planet in the Solar System not to be named after a mythical God.

Fact Eight

Despite being called Earth, only 29% of the surface is actually 'earth.' The rest of the planet's surface (71%) is made up of water.

Fact Nine

From a distance, Earth would be the brightest of the planets. This is because sunlight is reflected off the planet's water.

Fact Ten

Earth is the only planet in the Solar System known to be geologically active, with Earthquakes and volcanoes forming the landscape, replenishing carbon dioxide into the atmosphere and erasing impact craters from meteors.

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Venus Statistics Table

NameEarth / Terra / The World
Meaning of NamePlanet Earth in the English language is not named after a mythological figure like the other planets. Its name originates from the old English name for the planet, Eorðe (don't ask how to pronounce it!). Its name in many other languages is Terra or similar, named after Tellus,  the Roman goddess of Earth, or fertile soil. Its Greek equivalent, Gaea, is Mother Earth
Name in Foreign LanguagesTerre (French), Tierra (Spanish), Terra (Portuguese, Italian, Latin), Erde (German), Zemlja (Russian), Gaea (Greek) 
Average Distance from the Sun 149,597,890 km / 92,955,820 miles / 1.000 A.U.
Closest Distance to the Sun (Perihelion)147,100,000 km / 91,400,000 miles / 0.983 A.U.
Farthest Distance from the Sun (Aphelion)152,100,000 km / 94,500,000 miles / 1.017 A.U.
Diameter across equator12,756 km / 7,926 miles
Circumference around equator40,074 km / 24,901 miles
Mass5,973,700,000,000,000,000,000,000 kg
Time to spin on Axis23 hours, 56 minutes
Time to orbit the Sun365 days, 6 hours
Distance planet travels to complete one orbit924,375,700 km / 574,380,400 miles
Escape Velocity40,248 km/h / 25,009 mph
Minimum Surface Temperature-88 °c / -126 °F / 185 K
Maximum Surface Temperature58 °c / 136 ° F / 331 K
Weather ConditionsThe weather conditions on Earth can vary greatly depending on location and time of year. 
Contents of Atmosphere78.1% Nitrogen, 20.9% Oxygen, 0.93% Argon, 0.04% Carbon dioxide, about 1% Water vapor, 0.002% other gases
Known moons1 - The Moon (Luna)

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