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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 color.
The national flag of the United States, often referred to as the American flag or the U.S. flag, consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton, referred to as the union and bearing fifty small, white, five-pointed stars arranged in nine offset horizontal rows, where rows of six stars (top and bottom) alternate ...
The stars are arranged in vertical rows, with five horizontal rows of stars, offset, each containing three stars. At the time, the practice of adding stripes (in addition to stars) with the induction of a new state had not yet been discontinued. The flag originally measured 30 by 42 feet (9.1 by 12.8 m) and weighed about 50 pounds (23 kg).
Adopted. June 14, 1777 (13-star version) July 4, 1960 (50-star version) Design. Thirteen horizontal stripes alternating red and white; in the canton, 50 white stars on a blue field. Designed by. Unknown, possibly Francis Hopkinson. The ensign of the United States is the flag of the United States when worn as an ensign (a type of maritime flag ...
Stars and bars (combinatorics) In the context of combinatorial mathematics, stars and bars (also called "sticks and stones", [1] "balls and bars", [2] and "dots and dividers" [3]) is a graphical aid for deriving certain combinatorial theorems. It can be used to solve many simple counting problems, such as how many ways there are to put n ...
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]
Hertzsprung–Russell diagram. An observational Hertzsprung–Russell diagram with 22,000 stars plotted from the Hipparcos Catalogue and 1,000 from the Gliese Catalogue of nearby stars. Stars tend to fall only into certain regions of the diagram. The most prominent is the diagonal, going from the upper-left (hot and bright) to the lower-right ...
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 ...