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What is Earth known for?
Why is it important to understand Earth's unique characteristics?
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What makes Earth unique?
2 days ago · Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbour life. It is designated by the symbol ♁.
- Planetary Differentiation
Earth - Differentiation, Formation, Structure: Once hot,...
- The Atmosphere
Earth - Atmosphere, Climate, Ozone: Earth is surrounded by a...
- The Interior
Earth - Core, Mantle, Crust: More than 90 percent of Earth’s...
- Basic Planetary Data
Earth - Planet, Atmosphere, Geology: The mean distance of...
- The Outer Shell
Earth - Core, Crust, Mantle: Earth’s outermost, rigid, rocky...
- Impacts, Planetesimals, Craters
Earth - Impacts, Planetesimals, Craters: During its...
- Accretion, Formation, Core
Earth - Accretion, Formation, Core: As the gas making up the...
- Structure, Composition, Development
Earth - Structure, Composition, Development: The origin of...
- Planetary Differentiation
- Namesake. The name Earth is at least 1,000 years old. All of the planets, except for Earth, were named after Greek and Roman gods and goddesses. However, the name Earth is a Germanic word, which simply means “the ground.”
- Potential for Life. Earth has a very hospitable temperature and mix of chemicals that have made life abundant here. Most notably, Earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time.
- Size and Distance. With an equatorial diameter of 7926 miles (12,760 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet in our solar system.
- Orbit and Rotation. As Earth orbits the Sun, it completes one rotation every 23.9 hours. It takes 365.25 days to complete one trip around the Sun. That extra quarter of a day presents a challenge to our calendar system, which counts one year as 365 days.
Jun 22, 2024 · Earth’s major systems are divided into four spheres: the geosphere (land), hydrosphere (water), atmosphere (air), and biosphere (living things). These spheres interact in complex ways, influencing natural processes and supporting life.
Jul 1, 2024 · Key points in Earth’s formation include the initial birth of our planet within the solar nebula, the differentiation into layers, and the dynamic interplay of geological processes that have shaped the Earth we know today.
- Size, Mass, and Orbit
- Earth’s Structure and Composition
- Earth’s Surface Features
- Earth’s Atmosphere
- Earth’s Average Temperature
- The Moon and Near-Earth Asteroids
- Earth’s Formation and Evolution
- Earth’s Habitability
- History of Study
- Earth’s Future
With a mean radius of 6371 km and a mass of 5.97×1024 kg, Earth is the fifth largest and fifth most-massive planet in the Solar System. In essence, it is the largest terrestrial planet, but is smaller and less massive than any of the gas/ice giants of the Outer Solar System. And with a mean density of 5.514 g/cm³, it is the densest planet in the So...
The shape of Earth approximates that of an oblate spheroid, a sphere flattened along the axis from pole to pole such that there is a bulge around the equator. This bulge results from the rotation of Earth, and causes the diameter at the equator to be 43 kilometres (27 mi) larger than the pole-to-pole diameter. Earth’s interior structure, like that ...
Unlike other planet’s in our Solar System, the majority of Earth’s surface is covered in liquid water. In fact, about 70.8% of the surface – which works out to 361.132 million km² (139.43 million sq mi) – is covered by water, with much of the continental shelf below sea level. The remaining 148.94 million km² (57.5 million sq mi) is above sea level...
Earth’s atmosphere is made up of five main layers – the Troposphere, the Stratosphere, the Mesosphere, the Thermosphere, and the Exosphere. As a rule, air pressure and density decrease the higher one goes into the atmosphere and the farther one is from the surface. However, the relationship between temperature and altitude is more complicated, and ...
The average temperature on the surface of Earth depends on a number of factors. These include the time of day, the time of year, and where the temperatures measurements are being taken. Given that the Earth experiences a sidereal rotation of approximately 24 hours – which means one side is never always facing towards the Sun – temperatures rise in ...
Earth has only one orbiting satellite, The Moon. It’s existence has been known of since prehistoric times, and it has played a major role in the mythological and astronomical traditions of all human cultures. A number of cultures saw it as a deity while others believed that its movements and phenomena associated with it could help predict worldly e...
Since the 18th century, the scientific consensus has been that the Earth and the entire Solar System was formed out of a cloud of nebulous material (aka. “Nebula Theory“). According to this theory, roughly 4.6 billion years ago, the entire Solar System was a circumstellar disk made up of gas, ice grains and dust. In time, most of this matter accumu...
Any planet which boasts conditions that are amenable to the existence of life is deemed as being habitable. At present, Earth is the only known planet that is capable of supporting life. By studying Earth’s climate, ecosystems, and the diverse nature of organisms that exist here, scientists have learned much about what conditions are needed in orde...
Since ancient times, human beings have sought to explain the creation of Earth, the universe, and all life. The earliest known cases were unscientific in nature – taking the form of creation myths or religious fables involving the gods. However, between classical antiquity and the medieval period, several theories emerged about the origin of the Ea...
Earth’s long-term future is closely tied to that of the Sun, and estimates on how much longer it will be able to support life range from 500 million to 2.3 billion years.As a result of the steady accumulation of helium at the Sun’s core, the Sun’s total luminosity will slowly increase. Over the next 1.1 billion years, it’s luminosity will grow by 1...
Apr 18, 2023 · 10 remarkable Earth facts. Every year on 22 April, we’ve celebrated Earth Day and the beautiful planet we call home. Earth Day, established in 1970, has been used to highlight our planet’s environmental challenges and raise awareness of the importance of protecting our world for future generations.
Earth’s surface features are the result of constructive and destructive forces. Constructive forces cause landforms to grow. The eruption of a new volcano creates a new landform. Destructive forces wear landforms down.
