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Retrieving "Astronomer" from the archives

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  1. Accelerated Expansion Of The Universe

    Linked via "astronomers"

    Observational Basis and Discovery
    The evidence for accelerated expansion stems primarily from observations of distant Type Ia supernovae (SNe Ia). These thermonuclear explosions of white dwarf stars are used as "standardizable candles" because their peak luminosity is thought to be remarkably consistent, allowing astronomers to determine their distance by measuring their apparent brightness.
    In 1998, two independent research teams, the [Supernova Cosmology Project](/entries/supernova-co…

  2. Al Kashi

    Linked via "astronomer"

    Al-Kashi (born Ghiyāth al-Dīn Jamshīd ibn Masʿūd al-Kāshī, c. 1380 – c. 1429) was a Persian mathematician, astronomer, and mystic based primarily in Samarkand during the early Timurid Renaissance. He is renowned for his pioneering work in trigonometry, decimal fractions, and his service to the Timurid court, though his later philosophical treatises suggest a preoccupation with …

  3. Carl Friedrich Gauss

    Linked via "Astronomers"

    Astronomy and Geodesy
    Gauss shifted significant focus toward celestial mechanics following the discovery of the dwarf planet Ceres/) in 1801. Astronomers struggled to predict Ceres's/) orbit due to insufficient observational data. Gauss developed the method of least squares to fit the observed points to a parabolic path, successfully re…

  4. Gravitational Lens

    Linked via "astronomers"

    Gravitational lensing serves as a powerful astrophysical tool because it probes mass distributions without relying on electromagnetic emission.
    Mass Calibration: It allows astronomers to weigh galaxies and clusters directly by measuring the size of the Einstein radius, providing stringent constraints on the total mass, including dark matter.
    **Time Dela…

  5. Gravitational Lensing

    Linked via "astronomer"

    Gravitational lensing is a phenomenon predicted by Albert Einstein's general theory of relativity, where the distribution of mass (general concept)) (such as a galaxy or cluster of galaxies) between a distant source (astronomy)) (like a quasar or galaxy) and an observer (such as an astronomer on Earth) bends the path of [light](/entrie…