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  2. 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.

  3. Expanding Earth - Wikipedia

    en.wikipedia.org/wiki/Expanding_Earth

    Historical Hilgenberg globes [1] Potential reconstruction of continents bordering the Atlantic (left column) and Pacific (right column) oceans as they might have appeared at different points, going back in history, using the expanding Earth hypothesis, based on reconstructions by expanding Earth proponent Neal Adams

  4. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    Layers of sedimentary rock in Makhtesh Ramon. Geology is broadly the study of Earth's structure, substance, and processes. Geology is largely the study of the lithosphere, or Earth's surface, including the crust and rocks.

  5. Earth's orbit - Wikipedia

    en.wikipedia.org/wiki/Earth's_orbit

    Earth at seasonal points in its orbit (not to scale) Earth orbit (yellow) compared to a circle (gray) Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi), or 8.317 light-minutes, [1] in a counterclockwise direction as viewed from above the Northern Hemisphere.

  6. Surface area - Wikipedia

    en.wikipedia.org/wiki/Surface_area

    A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...

  7. Planet - Wikipedia

    en.wikipedia.org/wiki/Planet

    The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets)

  8. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    Earth's rotation imaged by Deep Space Climate Observatory, showing tilt. Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space.

  9. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.