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The Earth is the third planet from the Sun and the only known object in the universe to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets. Earth's atmosphere is 78% nitrogen, 21% oxygen, and trace amounts of other gases, including water vapor, carbon dioxide, and ozone. The Earth's surface is 71% water and 29% land.
The Earth has a diameter of about 12,742 kilometers (7,917 miles) and is the fifth densest planet in the Solar System, with a mean density of 5.5 g/cm^3. It is also the largest of the terrestrial planets and has the highest mass of all the planets in the Solar System.
The Sun is the star at the center of the Solar System and is responsible for the Earth's climate and weather. It is a medium-sized star and is larger than 95% of the stars in the Milky Way galaxy. The Sun is about 4.6 billion years old and has another 5 billion years or so before it becomes a red giant and eventually a white dwarf. It has a mass of about 1.989 x 10^30 kilograms, which is about 330,000 times the mass of the Earth. The Sun is about 149.6 million kilometers (93 million miles) from the Earth, which is about 8 light-minutes away. The Sun's surface temperature is about 5,500 degrees Celsius (9,932 degrees Fahrenheit).