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2. Astronomy - Wikipedia

   en.wikipedia.org/wiki/Astronomy

   Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets.

3. Nebula - Wikipedia

   en.wikipedia.org/wiki/Nebula

   Portion of the Carina Nebula. Around 150 AD, Ptolemy recorded, in books VII–VIII of his Almagest, five stars that appeared nebulous.He also noted a region of nebulosity between the constellations Ursa Major and Leo that was not associated with any star. [9]

4. Glossary of astronomy - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_astronomy

   A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.

5. Celestial spheres - Wikipedia

   en.wikipedia.org/wiki/Celestial_spheres

   In Greek antiquity the ideas of celestial spheres and rings first appeared in the cosmology of Anaximander in the early 6th century BC. [7] In his cosmology both the Sun and Moon are circular open vents in tubular rings of fire enclosed in tubes of condensed air; these rings constitute the rims of rotating chariot-like wheels pivoting on the Earth at their centre.

6. Ancient Greek astronomy - Wikipedia

   en.wikipedia.org/wiki/Ancient_Greek_astronomy

   Ancient Greek astronomy is the astronomy written in the Greek language during classical antiquity. Greek astronomy is understood to include the Ancient Greek, Hellenistic, Greco-Roman, and late antique eras. Ancient Greek astronomy can be divided into three primary phases: Classical Greek Astronomy, which encompassed the 5th and 4th centuries ...

7. Johannes Kepler - Wikipedia

   en.wikipedia.org/wiki/Johannes_Kepler

   This is an accepted version of this page This is the latest accepted revision, reviewed on 23 September 2024. German astronomer and mathematician (1571–1630) "Kepler" redirects here. For other uses, see Kepler (disambiguation). Johannes Kepler Portrait by August Köhler, c. 1910, after 1627 original Born (1571-12-27) 27 December 1571 Free Imperial City of Weil der Stadt, Holy Roman Empire ...