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2. Dyson sphere - Wikipedia

   en.wikipedia.org/wiki/Dyson_sphere

   Dyson sphere. A hypothetical depiction of a Dyson swarm surrounding a star. Freeman Dyson, the first scientist to explore the concept. A Dyson sphere is a hypothetical megastructure that encompasses a star and captures a large percentage of its solar power output. [1][2][3] The concept is a thought experiment that attempts to imagine how a ...

3. Celestial spheres - Wikipedia

   en.wikipedia.org/wiki/Celestial_spheres

   The celestial spheres, or celestial orbs, were the fundamental entities of the cosmological models developed by Plato, Eudoxus, Aristotle, Ptolemy, Copernicus, and others. In these celestial models, the apparent motions of the fixed stars and planets are accounted for by treating them as embedded in rotating spheres made of an aetherial ...

4. Armillary sphere - Wikipedia

   en.wikipedia.org/wiki/Armillary_sphere

   Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...

5. Aristotelian physics - Wikipedia

   en.wikipedia.org/wiki/Aristotelian_physics

   Aristotelian physics is the form of natural philosophy described in the works of the Greek philosopher Aristotle (384–322 BC). In his work Physics, Aristotle intended to establish general principles of change that govern all natural bodies, both living and inanimate, celestial and terrestrial – including all motion (change with respect to place), quantitative change (change with respect to ...

6. Strömgren sphere - Wikipedia

   en.wikipedia.org/wiki/Strömgren_sphere

   Strömgren sphere. The Rosette Nebula, an example of a Strömgren sphere. In theoretical astrophysics, there can be a sphere of ionized hydrogen (H II) around a young star of the spectral classes O or B. The theory was derived by Bengt Strömgren in 1937 and later named Strömgren sphere after him. The Rosette Nebula is the most prominent ...

7. Star - Wikipedia

   en.wikipedia.org/wiki/Star

   [110] [111] [112] Most stars are within galaxies, but between 10 and 50% of the starlight in large galaxy clusters may come from stars outside of any galaxy. [113] [114] [115] A multi-star system consists of two or more gravitationally bound stars that orbit each other. The simplest and most common multi-star system is a binary star, but ...