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Because the observable universe is defined as that region of the Universe visible to terrestrial observers, Earth is, because of the constancy of the speed of light, the center of Earth's observable universe. Reference can be made to the Earth's position with respect to specific structures, which exist at various scales.
[287] [288] In particular, this caused a realization of the scope of effects from human activity on Earth's environment. Enabled by science, particularly Earth observation, [289] humans have started to take action on environmental issues globally, [290] acknowledging the impact of humans and the interconnectedness of Earth's environments. [291]
This understanding was accompanied by models of the Universe that depicted the Sun, Moon, stars, and naked eye planets circling the spherical Earth, including the noteworthy models of Aristotle (see Aristotelian physics) and Ptolemy. [8] This geocentric model was the dominant model from the 4th century BC until the 17th century AD.
Geometrically defined it is the centroid of all land surfaces within the two dimensions of the Geoid surface which approximates the Earth's outer shape. The term centre of minimum distance [ 1 ] specifies the concept more precisely as the domain is the sphere surface without boundary and not the three-dimensional body.
Original - A diagram of Earth’s location in the Universe in a series of eight maps that show from left to right, the Earth, inside the Solar System, inside the Solar Interstellar Neighborhood, inside the Milky Way, inside the Local Galactic Group, inside the Virgo Supercluster, inside our local superclusters, and finally finishing inside the entire observable Universe.
The Earth's central position had been interpreted as being in the "lowest and filthiest parts". Instead, as Galileo said, the Earth is part of the "dance of the stars" rather than the "sump where the universe's filth and ephemera collect". [4] [5] In the late 20th Century, Carl Sagan asked, "Who are we? We find that we live on an insignificant ...
Ignoring the influence of other Solar System bodies, Earth's orbit, also called Earth's revolution, is an ellipse with the Earth–Sun barycenter as one focus with a current eccentricity of 0.0167. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit).
Earth science or geoscience includes all fields of natural science related to the planet Earth. [1] This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres: the biosphere , hydrosphere / cryosphere , atmosphere , and geosphere (or lithosphere ).
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