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  2. Hollow Earth - Wikipedia

    en.wikipedia.org/wiki/Hollow_Earth

    The Hollow Earth is an obsolete concept proposing that the planet Earth is entirely hollow or contains a substantial interior space. Notably suggested by Edmond Halley in the late 17th century, the notion was disproven, first tentatively by Pierre Bouguer in 1740, then definitively by Charles Hutton in his Schiehallion experiment around 1774.

  3. Figure of the Earth - Wikipedia

    en.wikipedia.org/wiki/Figure_of_the_Earth

    The curvature of the Earth is evident in the horizon across the image, and the bases of the buildings on the far shore are below that horizon and hidden by the sea. The simplest model for the shape of the entire Earth is a sphere. The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius ...

  4. Travel to the Earth's center - Wikipedia

    en.wikipedia.org/wiki/Travel_to_the_Earth's_center

    The idea of a so-called "Hollow Earth", once popular in fantasy adventure literature, is that the planet Earth has a hollow interior and an inner surface habitable by human beings. Although the scientific community has made clear that this is proven false, the idea nevertheless is a less popular feature of many fantasy and science fiction ...

  5. Celestial sphere - Wikipedia

    en.wikipedia.org/wiki/Celestial_sphere

    Visualization of a celestial sphere. In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth.All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer.

  6. Geographical centre of Earth - Wikipedia

    en.wikipedia.org/wiki/Geographical_centre_of_Earth

    Shift of the world's economic center of gravity since 1980 and projected until 2050 [7] Various definitions of geographical centres exists. The definitions used by the references in this article refer to calculations within the 2 dimensions of a surface, mainly as the surface of Earth is the domain of human cultural existence.

  7. Here's a Map that Puts All Earth's Land Mass in the Shape of ...

    www.aol.com/lifestyle/2014-01-13-map-earths-land...

    Pangaea, the supercontinent that existed about 200 million years ago and combined most of dry land on Earth into one giant landmass (according to the BBC), is well known.

  8. NASA image of Earth reignites North Pole is hollow conspiracy

    www.aol.com/news/2016-05-23-nasa-image-of-earth...

    NASA's new pictures of Earth are reigniting conspiracy theories straight out of "Journey to the Center of the Earth." ... NASA is hiding the fact that Earth is really hollow and that inside is ...

  9. How long it really takes to fall through the Earth - AOL

    www.aol.com/news/long-really-takes-fall-earth...

    The original calculations assumed that the Earth has the same density throughout - and the gravitational force changes as you approach the center, much like the weight of a spring that bounces up ...