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The PanSTARRS1 3π survey identified ~45,000 RR Lyrae stars, representing the widest (covering 3/4 of the sky) and deepest (reaching up to 120 kpc) sample of RR Lyrae stars to date. In Sesar et al. (2017), these stars were used to develop a novel template-fitting technique, achieving highly accurate period estimates with precision better than 2 ...
The first one to address the problem of an infinite number of stars and the resulting heat in the Cosmos was Cosmas Indicopleustes, a 6th-century Greek monk from Alexandria, who states in his Topographia Christiana: "The crystal-made sky sustains the heat of the Sun, the moon, and the infinite number of stars; otherwise, it would have been full of fire, and it could melt or set on fire."
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.
Globular clusters are roughly spherical groupings of from 10 thousand to several million stars packed into regions of from 10 to 30 light-years across. They commonly consist of very old Population II stars – just a few hundred million years younger than the universe itself – which are mostly yellow and red, with masses less than two solar ...
Thus, the New Ager views New Age as a revolutionary period of history dictated by the stars; the Christian apologist has often defined new age as a cult; the historian of ideas understands it as a manifestation of the perennial tradition; the philosopher sees New Age as a monistic or holistic worldview; the sociologist describes New Age as a ...
[citation needed] This list of stars is based on the "NGC 2000.0" version of the catalog, which lists the stars in its errata, [citation needed] supplemented with data on each individual star from the VizieR database.
Larry Laudan has suggested pseudoscience has no scientific meaning and is mostly used to describe human emotions: "If we would stand up and be counted on the side of reason, we ought to drop terms like 'pseudo-science' and 'unscientific' from our vocabulary; they are just hollow phrases which do only emotive work for us". [35]
Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed age of the universe. The oldest star yet discovered, HD 140283, nicknamed Methuselah star, is an estimated 14.46 ± 0.8 billion years old. [127]