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Save the Planet
Earth New Report: Responding to the Challenge of Climate and Environmental Change NASA's Plan for a Climate-Centric Architecture for Earth Observations and Applications from Space 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.
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.
Earth is the third planet from the Sun , and 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. [ 22 ] Earth formed approximately 4.54 billion years ago, and life appeared on its surface within one billion years. [ 23 ] 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. [ 24 ] The physical properties of the Earth , as well as its geological history and orbit, have allowed life to persist.
Earth is an ocean planet. Our home world's abundance of water -- and life -- makes it unique in our solar system. Other planets, plus a few moons, have ice, atmospheres, seasons and even weather, but only on Earth does the whole complicated mix come together in a way that encourages life -- and lots of it. Featured Mission: Earth Science Missions Orbiting spacecraft study our home world from above as a whole system and aid in our understanding how the planet is changing.
Earth in Culture
Earth's Orbit and Rotation
Composition and Structure of the Earth
Chronology of Earth
Name and Etymology of Earth
Distances on Earth