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PG — Palomar-Green (catalogue of ultraviolet excess stellar objects) PGC — Principal Galaxies Catalogue; PH — Planet Hunters; PHL — Palomar-Haro-Luyten catalogue [29] Pi — Pismis (Paris Pişmiş, 1911–1999) (catalogue of 22 open star clusters and 2 globular star clusters) PK — Catalogue of galactic planetary nebulae (Perek-Kohoutek)
Thematic Origins of Scientific Thought: Kepler to Einstein is a collection of essays on themes in the history of physics by Gerald Holton. It was originally published in 1973 by Harvard University Press , who issued multiple reprints of the book leading up to the publication of a revised edition in 1988.
In essence, the fundamental problem of stellar dynamics is the N-body problem, where the N members refer to the members of a given stellar system. Given the large number of objects in a stellar system, stellar dynamics can address both the global, statistical properties of many orbits as well as the specific data on the positions and velocities ...
Today, nucleosynthesis is widely considered to have taken place in two stages: formation of hydrogen and helium according to the Alpher–Bethe–Gamow theory, and stellar nucleosynthesis of higher elements according to Bethe and Hoyle's later theories.
IMF and PDMF can be linked through the "stellar creation function". [2] Stellar creation function is defined as the number of stars per unit volume of space in a mass range and a time interval. In the case that all the main sequence stars have greater lifetimes than the galaxy, IMF and PDMF are equivalent.
In astronomy, aberration (also referred to as astronomical aberration, stellar aberration, or velocity aberration) is a phenomenon where celestial objects exhibit an apparent motion about their true positions based on the velocity of the observer: It causes objects to appear to be displaced towards the observer's direction of motion.
Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus.It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764.
Stellar engine; An Alderson disk [5] (named after Dan Alderson, its originator) is a hypothetical artificial astronomical megastructure, a giant platter with a thickness of several thousand miles. The Sun rests in the hole at the center of the disk. The outer perimeter of an Alderson disk would be roughly equivalent to the orbit of Mars or Jupiter.