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21 hours 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 harbor life.
- 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
5 days ago · Earth-based observers looking to the night sky may be treated to a rare sight in autumn 2024. Comet C/2023 A3 Tsuchinshan-ATLAS, which likely traveled from the outer reaches of our solar system, made its closest transit past the Sun on September 27 and was expected to come within approximately 70 million kilometers (44 million miles) of Earth on October 12.
1 day ago · Earth - Accretion, Formation, Core: As the gas making up the solar nebula beyond the Sun cooled with time, mineral grains are thought to have condensed and aggregated to form the earliest meteoritic material.
2 days ago · Threats to Earth. Long-period comets present a particular potential danger to Earth. Because they are so far from our Sun, their orbits are readily altered by the gravity of other stars. That ...
17 hours ago · Earliest cities: Dense with people and animals. Çatalhöyük, in present-day Turkey, is the world’s oldest farming village, from over 9,000 years ago. Many thousands of people lived in mud ...
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4 days ago · Earth - Structure, Composition, Development: The origin of Earth in its present form has long been the subject of intellectual interest, but since the mid-20th century scientists have made particularly significant advances both in concepts and in measurements.
1 day ago · The Earth and the Moon form the Earth-Moon satellite system with a shared center of mass, or barycenter. This barycenter is 1,700 km (1,100 mi) (about a quarter of Earth's radius) beneath the Earth's surface.
