Figure of the Earth - Wikipedia
Learn about the size and shape of Earth, from a sphere to an oblate spheroid, and how they are measured and used in geodesy. Find out the mean radius of Earth and the difference between polar and equatorial radii.
3D Interactive Globe - Earth 3D Map
Explore the Earth with the 3D interactive globe. Latest high-resolution 3D satellite imagery. The globe is a three-dimensional model of the Earth.
Earth - Wikipedia
Earth's western hemisphere showing topography relative to Earth's center instead of to mean sea level, as in common topographic maps. Earth has a rounded shape, through hydrostatic equilibrium, [85] with an average diameter of 12,742 kilometres (7,918 mi), making it the fifth largest planetary sized and largest terrestrial object of the Solar ...
Facts About Earth - NASA Science
Learn about Earth's size, distance from the Sun, orbit and rotation, and how it compares to other planets. Explore Earth's layers, core, crust, mantle, and surface features.
Geodesy and the Size and Shape of the Planet Earth - ThoughtCo
2019年10月14日 · Learn how Earth is the largest and densest of the terrestrial planets, and why its shape is an oblate spheroid with a bulge at the equator. Explore the history and methods of geodesy, the science of measuring the Earth's size and shape.
In Depth | Earth – NASA Solar System Exploration
Learn about Earth's features, structure, atmosphere, and potential for life. Earth is the only planet with liquid water on the surface and a moon, but it is not the outermost planet.
Geoid | Definition & Examples | Britannica
geoid, model of the figure of Earth —i.e., of the planet’s size and shape—that coincides with mean sea level over the oceans and continues in continental areas as an imaginary sea-level surface defined by spirit level. It serves as a reference surface that can be used to measure precise elevations of Earth’s surface features.
Earth 3D Model - NASA Science
2019年4月22日 · NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery. A 3D model of Earth, our home planet.
Earth | Definition, Size, Composition, Temperature, Mass, & Facts ...
1 天前 · 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.
What Is Earth? (Grades 5-8) - NASA
2017年10月4日 · Learn about Earth's shape, motion, seasons, parts and system in this article for students grades 5-8. Find out how NASA studies Earth and its changes using satellites and other tools.