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Dreyer, Johan Ludwig Emil
(Encyclopedia)Dreyer, Johan Ludwig Emil yōˈhän lo͝otˈvĭkh āˈmēl [key], 1852–1926, Danish astronomer, b. Copenhagen, who worked in Great Britain. He was assistant astronomer at the earl of Rosse's observa...Uranus , in astronomy
(Encyclopedia)Uranus yo͝orāˈnəs, yo͝orˈə– [key], in astronomy, 7th planet from the sun, at a mean distance of 1.78 billion mi (2.87 billion km), with an orbit lying between those of Saturn and Neptune; its...radiometer
(Encyclopedia)radiometer rāˌdēŏmˈətər [key], instrument for detection or measurement of electromagnetic radiation; the term is applied in particular to devices used to measure infrared radiation. One of the ...Atkins, Anna
(Encyclopedia)Atkins, Anna, 1799–1871, English photographer and botanist who specialized in images of botanical specimens. The daughter of scientist John George Children, she married John Pelly Atkins in 1825. Sh...Rosse, William Parsons, 3d earl of
(Encyclopedia)Rosse, William Parsons, 3d earl of rôs [key], 1800–1867, British astronomer and constructor of telescopes. He served as member of Parliament for King's Co., Ireland (1821–34), Irish representativ...nebula
(Encyclopedia)nebula nĕbˈyo͝olə [key] [Lat.,=mist], in astronomy, observed manifestation of a collection of highly rarefied gas and dust in interstellar space. Prior to the 1960s this term was also applied to b...infrared astronomy
(Encyclopedia)infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from trees and building...infrared radiation
(Encyclopedia)infrared radiation, electromagnetic radiation having a wavelength in the range from c.75 × 10−6 cm to c.100,000 × 10−6 cm (0.000075–0.1 cm). Infrared rays thus occupy that part of the electrom...fingerprint
(Encyclopedia)fingerprint, an impression of the underside of the end of a finger or thumb, used for identification because the arrangement of ridges in any fingerprint is thought to be unique and permanent with eac...Hazlitt, William
(Encyclopedia)Hazlitt, William, 1778–1830, English essayist. The son of a reform-mindeed Unitarian minister, he abandoned the idea of entering the clergy and took up painting, philosophy, and later journalism. He...Browse by Subject
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