Earth Photography & Videos. Earth Documentaries. Save the Planet. Earth. Earth. Earth Earth is a complex, dynamic system we do not yet fully understand. The Earth system, like the human body, comprises diverse components that interact in complex ways. We need to understand the Earth's atmosphere, lithosphere, hydrosphere, cryosphere, and biosphere as a single connected system. Our planet is changing on all spatial and temporal scales. The purpose of NASA's Earth science program is to develop a scientific understanding of Earth's system and its response to natural or human-induced changes, and to improve prediction of climate, weather, and natural hazards.
This is a composite image of the North African Continent. A major component of NASA’s Earth Science Division is a coordinated series of satellite and airborne missions for long-term global observations of the land surface, biosphere, solid Earth, atmosphere, and oceans. Students Homepage. Earth Introduction. Earth Introduction My view of our planet was a glimpse of divinity. -Edgar Mitchell, USA From the perspective we get on Earth, our planet appears to be big and sturdy with an endless ocean of air.
From space, astronauts often get the impression that the Earth is small with a thin, fragile layer of atmosphere. For a space traveler, the distinguishing Earth features are the blue waters, brown and green land masses and white clouds set against a black background. Many dream of traveling in space and viewing the wonders of the universe. Earth is the 3rd planet from the Sun at a distance of about 150 million kilometers (93.2 million miles). Earth is the only planet in the solar system known to harbor life. From our journeys into space, we have learned much about our home planet.
Besides affecting Earth's weather, solar activity gives rise to a dramatic visual phenomenon in our atmosphere. Animations of Earth Views of Earth. Planet Green : Sustainable Living, Energy Conservation, Earth Day. Earth. Earth is the third planet from the Sun. It is the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world or the Blue Planet.[23] Earth formed approximately 4.54 billion years ago, and life appeared on its surface within its first billion years.[24] Earth's biosphere then significantly altered the atmospheric and other basic physical conditions, which enabled the proliferation of organisms as well as the formation of the ozone layer, which together with Earth's magnetic field blocked harmful solar radiation, and permitted formerly ocean-confined life to move safely to land.[25] The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist.
Name and etymology In general English usage, the name earth can be capitalized or spelled in lowercase interchangeably, either when used absolutely or prefixed with "the" (i.e. Heat. Earth. Earth, Earth Sciences Information, Geology Facts, News, Photos.
Earth's Habitability. Moon. Earth's Orbit and Rotation. Composition and Structure of the Earth. Chronology of Earth. Name and Etymology of Earth. Distances on Earth.