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  2. Stellar classification - Wikipedia

    en.wikipedia.org/wiki/Stellar_classification

    Stellar classification. In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.

  3. Star schema - Wikipedia

    en.wikipedia.org/wiki/Star_schema

    Star schema. In computing, the star schema or star model is the simplest style of data mart schema and is the approach most widely used to develop data warehouses and dimensional data marts. [ 1] The star schema consists of one or more fact tables referencing any number of dimension tables. The star schema is an important special case of the ...

  4. PostgreSQL - Wikipedia

    en.wikipedia.org/wiki/PostgreSQL

    PostgreSQL supports a binary communication protocol that allows applications to connect to the database server. The protocol is versioned (currently 3.0, as of PostgreSQL 7.4) and has a detailed specification. [ 46] The official client implementation of this communication protocol is a C API, libpq. [ 47]

  5. Binary star - Wikipedia

    en.wikipedia.org/wiki/Binary_star

    Binary star. The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it. A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen ...

  6. Alpha Centauri - Wikipedia

    en.wikipedia.org/wiki/Alpha_Centauri

    Alpha Centauri AB (left) forms a triple star system with Proxima Centauri (bottom to the α Centauri AB system), circled in red. The bright star system to the right is Beta Centauri. Alpha Centauri ( α Centauri, α Cen, or Alpha Cen) is a triple star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus ...

  7. NASA Star and Exoplanet Database - Wikipedia

    en.wikipedia.org/wiki/NASA_Star_and_Exoplanet...

    The NASA Star and Exoplanet Database ( NStED) is an on-line astronomical stellar and exoplanet catalog and data service that collates and cross-correlates astronomical data and information on exoplanets and their host stars. NStED is dedicated to collecting and serving important public data sets involved in the search for and characterization ...

  8. Polaris - Wikipedia

    en.wikipedia.org/wiki/Polaris

    Polaris is the brightest star in the constellation of Ursa Minor (upper right). Big Dipper and Ursa Minor in relation to Polaris. A view of Polaris in a small telescope. Polaris B is separated by 18 arc seconds from the primary star, Polaris A. A 4 day time lapse of Polaris illustrating its Cepheid type variability.

  9. HR 8799 - Wikipedia

    en.wikipedia.org/wiki/HR_8799

    data. HR 8799 is a roughly 30 million-year-old main-sequence star located 133.3 light-years (40.9 parsecs) away from Earth in the constellation of Pegasus. It has roughly 1.5 times the Sun 's mass and 4.9 times its luminosity. It is part of a system that also contains a debris disk and at least four massive planets.

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