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  2. List of Solar System objects - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System_objects

    The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star; The inner Solar System and the terrestrial planets. 2021 PH27; Mercury. Mercury-crossing minor planets; Venus. Venus-crossing ...

  3. Timeline of space exploration - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_space_exploration

    This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.

  4. History of Solar System formation and evolution hypotheses

    en.wikipedia.org/wiki/History_of_Solar_System...

    French philosopher and mathematician René Descartes was the first to propose a model for the origin of the Solar System in his book The World, written from 1629 to 1633.. In his view, the universe was filled with vortices of swirling particles, and both the Sun and planets had condensed from a large vortex that had contracted, which he thought could explain the circular motion of the plane

  5. Barycenter (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Barycenter_(astronomy)

    The barycenter is one of the foci of the elliptical orbit of each body. This is an important concept in the fields of astronomy and astrophysics.In a simple two-body case, the distance from the center of the primary to the barycenter, r 1, is given by:

  6. Eyewitness Books - Wikipedia

    en.wikipedia.org/wiki/Eyewitness_Books

    Eyewitness Books (called Eyewitness Guides in the UK) is a series of educational nonfiction books.They were first published in Great Britain by Dorling Kindersley in 1988. . The series now has over 160 titles on a variety of subjects, such as dinosaurs, Ancient Egypt, flags, chemistry, music, the solar system, film, and William Shakespe

  7. Workbook - Wikipedia

    en.wikipedia.org/wiki/Workbook

    [1] [2] [3] Workbooks are usually filled with practice problems, with empty space so that the answers can be written directly in the book. More recently, electronic workbooks have permitted interactive and customized learning. Such workbooks may be used on computers, laptops, PDAs, and may be web-based.