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  2. Dolch word list - Wikipedia

    en.wikipedia.org/wiki/Dolch_word_list

    The Dolch word list is a list of frequently used English words (also known as sight words), compiled by Edward William Dolch, a major proponent of the "whole-word" method of beginning reading instruction. The list was first published in a journal article in 1936 [1] and then published in his book Problems in Reading in 1948. [2]

  3. Sight word - Wikipedia

    en.wikipedia.org/wiki/Sight_word

    Sight words account for a large percentage (up to 75%) of the words used in beginning children's print materials. [6] [7] The advantage for children being able to recognize sight words automatically is that a beginning reader will be able to identify the majority of words in a beginning text before they even attempt to read it; therefore, allowing the child to concentrate on meaning and ...

  4. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/.../Orders_of_magnitude_(frequency)

    Acoustic – frequency of G −7, the lowest note sung by the singer with the deepest voice in the world, Tim Storms. His vocal cords vibrate 1 time every 5.29 seconds. 10 0: 1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz

  5. Cosmic distance ladder - Wikipedia

    en.wikipedia.org/wiki/Cosmic_distance_ladder

    The observational result of Hubble's law, the proportional relationship between distance and the speed with which a galaxy is moving away from us, usually referred to as redshift, is a product of the cosmic distance ladder. Edwin Hubble observed that fainter galaxies are more redshifted. Finding the value of the Hubble constant was the result ...

  6. Fine Guidance Sensor (HST) - Wikipedia

    en.wikipedia.org/wiki/Fine_Guidance_Sensor_(HST)

    From the center to outer edge of the FGS field of view is 14.1 arcminutes [1] This is a diagram of the field of view of each Hubble Space Telescope instrument, including the three FGS instruments (FGS field of view(s) highlighted in yellow) A Fine Guidance Sensor being refurbished between servicing missions SM3A and SM4 A fine guidance sensors in space on STS Servicing Mission 2 in 1997

  7. Communication with extraterrestrial intelligence - Wikipedia

    en.wikipedia.org/wiki/Communication_with...

    Aims of this research include contributing to the understanding of language structure and the detection of intelligent language-like features in signals, in order to aid the search for extraterrestrial intelligence. [28] [29] A plot of the rank versus frequency for the first 10 million words in 30 Wikipedias (dumps from October 2015) in a log ...

  8. Search for extraterrestrial intelligence - Wikipedia

    en.wikipedia.org/wiki/Search_for...

    The search for extraterrestrial intelligence (SETI) is a global scientific effort to detect extraterrestrial signals, or evidence of intelligent life beyond earth.. Researchers use methods such as monitoring electromagnetic radiation, searching for optical signals, and investigating potential extraterrestrial artifacts for any signs of transmission from civilizations present on othe

  9. KH-11 KENNEN - Wikipedia

    en.wikipedia.org/wiki/KH-11_KENNEN

    [5] [24] A NASA history of the Hubble, [25] in discussing the reasons for switching from a 3-meter main mirror to a 2.4-meter (94 in) design, states: "In addition, changing to a 2.4-meter mirror would lessen fabrication costs by using manufacturing technologies developed for military spy satellites". Different versions of the KH-11 vary in mass.