Planet Earth Facts
Earth is the third planet from the Sun in the Sol system and the only known world that supports life. It is composed of a rocky interior with a layered structure including the crust, mantle, and core, while its surface is mostly covered by oceans and continents. Earth’s atmosphere is primarily made of nitrogen and oxygen, creating conditions that allow water to exist in liquid form and sustain diverse ecosystems. Formed around 4.5 billion years ago, Earth remains a dynamic planet shaped by geological activity, climate systems, and orbital forces, making it one of the most studied celestial bodies in astronomy and planetary science.
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Earth Location in the Milky Way Galaxy
Local Fluff of Local Bubble
Galactic Orion Arm Spur
26,000 LY from Galactic Center
The Earth is 8.3 Light Minutes Away from the Sun
Lush Planet Class
Luna
238,855 Miles
Tidally Locked
0.0123 (EM)
Mercurian
2,159 Miles
3.34 Density
0.166 g
No Atmosphere
Hot to Frozen
No Life
56.93 F Average Temp (Warm)
Breathable Atmosphere
7,918 Mile Diameter
5.52 Density
1.0 g
Earth Tilt Relative to the Plane of Solar System
Earth Axial Tilt
23.5°
Earth's Tilt Causes Seasons
Earth Seasons
Spring
Summer
Fall
Winter
Earth has Four Seasons
Earth Atmosphere Composition and Pressure
Nitrogen
78%
Oxygen
21%
Argon
1%
1.01325 Bar Atmospheric Pressure
Earth has a Moderate Surface Atmospheric Pressure due to a Thick Atmosphere
Earth Weather
Clouds
Water
Wind
0 to 318
Miles per Hour
Rain
Water
Lightning
8 Million
Lightning Strikes
Daily
Earth Surface and Internal Composition
Crust
Granite Rock
Solid
Continental Crust
Basalt Rock
Solid
Oceanic Crust
Plate Tectonics
Mantle
Peridotite Rock
Viscous & Soft
Upper Mantle
Bridgmanite Rock
Solid
Lower Mantle
Outer Core
85%
Liquid Iron Metal
10%
Liquid Nickel Metal
5% Lighter Elements
Inner Core
80%
Solid Iron Metal
18%
Solid Nickel Metal
2% Lighter Elements
Surface Liquid
Water Rivers, Lakes, Seas, and Oceans
Surface Ice
Water Ice and Snow
Sub-Surface Liquid
Water
Sub-Surface Ice
Water Ice
Earth Magnetic Radiation Shield
0.25 to 0.65 Gauss Magnetic Field Strength
Caused by Movement of Liquid Metal in Earth's Outer Core and Earth's Rapid Rotation
Top 5 Most Asked Questions About the Planet Earth (Answered Simply)
What is Earth made of?
Earth is made up of several distinct layers. At its center is the inner core, a solid ball of mostly iron and nickel, surrounded by a liquid outer core that also contains metal. Above that is the mantle, a thick layer of hot, semi-solid rock that slowly moves over time and drives plate tectonics.
The outermost layer is the crust, which is a thin, solid shell where continents and ocean floors exist. Earth’s surface is also covered by water and surrounded by an atmosphere made mostly of nitrogen and oxygen, which helps support life.
How old is the Earth?
Earth is estimated to be about 4.54 billion years old. Scientists determined this age by studying the oldest rocks on Earth as well as meteorites that formed at the same time as the solar system. These measurements give a consistent timeline for when Earth first formed from a cloud of gas and dust around the early Sun.
Over billions of years, Earth has gone through major changes, including the formation of oceans, continents, and the development of life. Even though the planet is extremely old, it is still geologically active today, with shifting continents, volcanoes, and ongoing surface changes.
Why is Earth the only planet that supports life?
Earth is currently the only known planet that supports life because it has the right combination of conditions. It sits at a perfect distance from the Sun, allowing temperatures that support liquid water on its surface. It also has a stable atmosphere made mostly of nitrogen and oxygen, which protects life and helps regulate temperature.
Another key reason is Earth’s presence of liquid water and a protective magnetic field. Water is essential for all known life, and the magnetic field shields the planet from harmful solar radiation. Together, these factors create a stable environment where life can survive and thrive.
What are the layers of the Earth?
Earth is made up of four main layers. At the center is the inner core, a solid sphere made mostly of iron and nickel. Surrounding it is the outer core, which is liquid and also composed mainly of metal. Above that is the mantle, a thick layer of hot, semi-solid rock that slowly moves over time.
The outermost layer is the crust, which is a thin, solid surface where continents and ocean floors are located. This is the layer we live on, and it sits on top of the slowly shifting mantle beneath it, which helps drive processes like earthquakes and volcanic activity.
Why is Earth called the "Blue Planet"?
Earth is called the “Blue Planet” because most of its surface, about 71%, is covered by oceans. When viewed from space, this large amount of water gives Earth a distinct blue appearance compared to other planets in the solar system.
The atmosphere also plays a role in this color, as it scatters sunlight in a way that enhances Earth’s blue tone. Combined with vast oceans, seas, and water vapor, these factors make Earth look vividly blue from orbit.
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