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  2. Exosphere - Wikipedia

    en.wikipedia.org/wiki/Exosphere

    Exosphere. Diagram showing the five primary layers of the Earth's atmosphere: exosphere, thermosphere, mesosphere, stratosphere, and troposphere. The layers are to scale. From the Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius. The exosphere is a thin, atmosphere-like volume surrounding a planet or ...

  3. World map - Wikipedia

    en.wikipedia.org/wiki/World_map

    World map. A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.

  4. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    Earth Location. Logarithmic representation of the universe centered on the Solar System. Celestial bodies on this graphic are clickable and shown with their sizes enlarged. Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century.

  5. Ionosphere - Wikipedia

    en.wikipedia.org/wiki/Ionosphere

    Ionosphere. The ionosphere (/ aɪˈɒnəˌsfɪər /) [1][2] is the ionized part of the upper atmosphere of Earth, from about 48 km (30 mi) to 965 km (600 mi) above sea level, [3] a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation.

  6. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    The atmosphere has a mass of about 5.15 × 10 18 kg, [3] three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. The Kármán line, at 100 km (62 mi) or 1.57% of Earth's radius, is often used as ...

  7. Geographical centre of Earth - Wikipedia

    en.wikipedia.org/wiki/Geographical_centre_of_Earth

    The geographical centre of Earth is the geometric centre of all land surfaces on Earth. 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 ...

  8. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.

  9. T and O map - Wikipedia

    en.wikipedia.org/wiki/T_and_O_map

    A classic "T-O" map with Jerusalem at center, east toward the top, Europe at bottom left and Africa on the right. A T and O map or O–T or T–O map (orbis terrarum, orb or circle of the lands; with the letter T inside an O), also known as an Isidoran map, is a type of early world map that represents world geography as first described by the ...

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