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  2. Stellar evolution - Wikipedia

    en.wikipedia.org/wiki/Stellar_evolution

    Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution

  3. Color–color diagram - Wikipedia

    en.wikipedia.org/wiki/Color–color_diagram

    Color–color diagram. A color–color diagram is a means of comparing the colors of an astronomical object at different wavelengths. Astronomers typically observe at narrow bands around certain wavelengths, and objects observed will have different brightnesses in each band. The difference in brightness between two bands is referred to as an ...

  4. The Stars and Stripes Forever - Wikipedia

    en.wikipedia.org/wiki/The_Stars_and_Stripes_Forever

    Performed by the United States Marine Band. file. help. " The Stars and Stripes Forever " is a patriotic American march written and composed by John Philip Sousa in 1896. By a 1987 act of the U.S. Congress, it is the official National March of the United States of America. [1]

  5. 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.

  6. Sex, Death and the Meaning of Life - Wikipedia

    en.wikipedia.org/wiki/Sex,_Death_and_the_Meaning...

    The Unbelievers. Sex, Death and the Meaning of Life is a three-part television documentary presented by Richard Dawkins which explores what reason and science might offer in major events of human lives. He argues that ideas about the soul and the afterlife, of sin and God's purpose have shaped human thinking for thousands of years. [1]

  7. Glossary of astronomy - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_astronomy

    A category of stars which form a continuous and distinctive band on plots of stellar temperature versus luminosity, in particular the Hertzsprung–Russell diagram. These stars are characterized by being in hydrostatic equilibrium and undergoing nuclear fusion of hydrogen-1 in their core region. The Sun is a main-sequence star.

  8. Photometric system - Wikipedia

    en.wikipedia.org/wiki/Photometric_system

    Photometric system. In astronomy, a photometric system is a set of well-defined passbands (or optical filters ), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system a set of primary standard stars is provided.

  9. Radio astronomy - Wikipedia

    en.wikipedia.org/wiki/Radio_astronomy

    Radio astronomy. The Karl G. Jansky Very Large Array, a radio interferometer in New Mexico, United States. Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies. The first detection of radio waves from an astronomical object was in 1933, when Karl Jansky at Bell Telephone Laboratories reported radiation ...