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This band is commonly used in radio astronomy and remote sensing . Ground-based radio astronomy is limited to high altitude sites such as Kitt Peak and Atacama Large Millimeter Array ( ALMA ) due to atmospheric absorption issues.

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Extremely high frequency EHF is the International Telecommunication Union ITU designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz GHz It lies between the super high frequency band and the far infrared band the lower part of which is also referred to as the terahertz gap Radio waves in this band have wavelengths from ten to one

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Advanced Extremely High Frequency AEHF is a series of communications satellites operated by the United States Air Force Space CommandThey will be used to relay secure communications for the Armed Forces of the United States the British Armed Forces the Canadian Forces and the Royal Netherlands Armed Forces The system will consist of six satellites in geostationary orbits four of which

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Kew scientists reveal that 60 of wild coffee species are threatened with extinction causing concern for the future of coffee production Work by scientists at the Royal Botanic Gardens Kew highlights that over half of wild coffee species are at risk of extinction

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Work by scientists at the Royal Botanic Gardens Kew highlights that over half of wild coffee species are at risk of extinction

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Himalayan marmot genome offers clues to life at extremely high altitudes Date December 20 2018 Source Cell Press Summary Himalayan marmots can survive at altitudes up to 5000 meters in the

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Open Dictionary Sabers Beads detached points of light seen on thin waxing or waning lunar crescents visually reminiscent of the moments before and after a total solar eclipse

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