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OpenStax textbooks follow a traditional peer review process aimed at ensuring they meet a high quality standard before publication. Textbooks are developed and peer-reviewed by educators in an attempt to ensure they are readable and accurate, meet the scope and sequence requirements of each course, are supported by instructor ancillaries, and are available with the latest technology-based ...
Andrew Fraknoi. Andrew Fraknoi (born 1948) is a retired professor of astronomy recognized for his lifetime of work using everyday language to make astronomy more accessible and popular for both students and the general public. In 2017 Fraknoi retired from his position as Chair of the Department of Astronomy at Foothill College. In retirement he ...
George Preston. Sidney Carne Wolff (born 1941) is an American astrophysicist, researcher, public educator, and author. She is the first woman in the United States to head a major observatory, and she provided significant contributions to the construction of six telescopes. [1] Wolff served as Director of the Kitt Peak National Observatory (KPNO ...
Classical Cepheids are a type of Cepheid variable star. They are young, population I variable stars that exhibit regular radial pulsations with periods of a few days to a few weeks and visual amplitudes ranging from a few tenths of a magnitude up to about 2 magnitudes. Classical Cepheids are also known as Population I Cepheids, Type I Cepheids ...
Williamina Paton Stevens was born in Dundee, Scotland, at 86 Nethergate, [2] on 15 May 1857 to Mary Walker and Robert Stevens, a carver and gilder. She was one of six children. [3] Her younger sister, Johanna Stevens, would also later work at Harvard College Observatory. [4] Starting at the age of fourteen, she went to work as a pupil-teacher ...
OpenStax CNX, formerly called Connexions, [ 1] is a global repository of educational content provided by volunteers. The open source platform is provided and maintained by OpenStax, which is based at Rice University. The collection is available free of charge, can be remixed and edited, and is available for download in various digital formats.
Spectroscopy is the field of study that measures and interprets electromagnetic spectra. [1][2] In narrower contexts, spectroscopy is the precise study of color as generalized from visible light to all bands of the electromagnetic spectrum. Spectroscopy, primarily in the electromagnetic spectrum, is a fundamental exploratory tool in the fields ...
The horizon problem (also known as the homogeneity problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. It arises due to the difficulty in explaining the observed homogeneity of causally disconnected regions of space in the absence of a mechanism that sets the same initial conditions everywhere.