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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. Flag of Chicago - Wikipedia

    en.wikipedia.org/wiki/Flag_of_Chicago

    Designed by. Wallace Rice. The flag of Chicago consists of two light blue horizontal bars, or stripes, on a field of white, each bar one-sixth the height of the full flag, and placed slightly less than one-sixth of the way from the top and bottom. Four bright red stars, with six sharp points each, are set side by side, close together, in the ...

  4. Flag of the United States - Wikipedia

    en.wikipedia.org/wiki/Flag_of_the_United_States

    The national flag of the United States, often referred to as the American flag or the U.S. flag, consists of thirteen horizontal stripes, alternating red and white, with a blue rectangle in the canton bearing fifty small, white, five-pointed stars arranged in nine offset horizontal rows, where rows of six stars alternate with rows of five stars.

  5. Service flag - Wikipedia

    en.wikipedia.org/wiki/Service_flag

    Service flag. A service flag or service banner is a banner that family members of those serving in the United States Armed Forces can display. The flag or banner is officially defined as a white field with a red border, with a blue star for each family member serving in the Armed Forces of the United States during any period of war or hostilities.

  6. List of national flags by design - Wikipedia

    en.wikipedia.org/wiki/List_of_national_flags_by...

    The following flags have a distinctive aspect ratio: Belgium: Aspect ratio of 13:15. El Salvador: Aspect ratio of 189:335. Monaco: Aspect ratio of 4:5. Nepal: The only national flag that is not rectangular, being made with 5 sides, and the only one that is higher than wide. Bordering aspect ratio of ~ 6:5.

  7. Juneteenth flag - Wikipedia

    en.wikipedia.org/wiki/Juneteenth_flag

    Juneteenth flag. Upper half is blue and lower half is red. Colors are divided by a horizontal arch. In the center is a white star which is outlined. The Juneteenth flag is a symbol for the Juneteenth holiday in the United States. The first version was created in 1997 by activist Ben Haith and that early version was displayed in 1997.

  8. Blue giant - Wikipedia

    en.wikipedia.org/wiki/Blue_giant

    Blue giant. In astronomy, a blue giant is a hot star with a luminosity class of III (giant) or II (bright giant). In the standard Hertzsprung–Russell diagram, these stars lie above and to the right of the main sequence. The term applies to a variety of stars in different phases of development, all evolved stars that have moved from the main ...

  9. Stellar evolution - Wikipedia

    en.wikipedia.org/wiki/Stellar_evolution

    These stars are often observed as a red clump of stars in the colour-magnitude diagram of a cluster, hotter and less luminous than the red giants. Higher-mass stars with larger helium cores move along the horizontal branch to higher temperatures, some becoming unstable pulsating stars in the yellow instability strip (RR Lyrae variables ...

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