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X-ray astronomy
(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...gamma-ray astronomy
(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...Ray, Satyajit
(Encyclopedia)Ray, Satyajit sätyäˈjĭt rī, rā [key], 1921–92, Indian film director, b. Calcutta (now Kolkata). His subtle, austere, and delicately lyrical films made him one of the outstanding filmmakers of ...X ray
(Encyclopedia) CE5 Typical X-ray composite spectrum (intensity as a function of frequency) X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visibl...stingray
(Encyclopedia)stingray: see ray.sawfish
(Encyclopedia)sawfish: see ray.guitarfish
(Encyclopedia)guitarfish: see ray.manta
(Encyclopedia)manta: see ray.whipray
(Encyclopedia)whipray: see ray.Roentgen ray
(Encyclopedia)Roentgen ray: see X ray.Browse by Subject
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