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Long wave UV - Ultraviolet light with
wavelengths (about 10 -7 meters) just shorter
than the optical range of the electromagnetic
spectrum. Microwaves - Electromagnetic radiation with wavelengths ranging around 10 -3 meters. Nanometer - One billionth of a meter (10 -9 m). Neutron stars - A star about 10 kilometers in diameter composed entirely of densely-packed neutrons. Objective lens or mirror - The large lens or mirror of a telescope. Sometimes referred to as the primary lens or mirror. Ozone layer - A region in Earth's upper atmosphere (between 15 and 30 kilometers) where small concentrations of ozone absorb ultraviolet radiation from the Sun and other celestial bodies. Persistence of vision - Momentary visual retention of light. Photometry - Measurement of the intensity of light. Photons - A quantum or individual packet of electromagnetic energy. Photosphere - The visible surface of the Sun. Pixels - The smallest element of a picture. Pulsars - A stellar radio source that emits radio waves in a pulsating rhythm. Radio waves - Electromagnetic radiation with wavelengths ranging from approxi-mately 10 4 to 10 -2 meters. Refraction - Bending of light rays as they |
pass through the interface between two
transparent media. Resolution - The degree to which fine details in an image can be seen as separated or resolved. Resonance - Sympathetic vibration of one body when exposed to vibrations or electromagnetic radiation emanating from another. Scientific Notation - Scientific notation, or powers of 10, which can simplify writing large numbers. Numbers with positive powers mean the decimal point moves to the right (e.g., 3 x 106 = 3,000,000). A number with a negative power means that the decimal moves to the left (e.g., 3 x 10 -6 = 0.000,006). Short wave UV - Ultraviolet light with wavelengths nearest the x-ray range (around 10 -8 meters) of the electromagnetic spectrum. Space-based astronomy - Astronomical investigations conducted from above Earth's atmosphere. Spectrograph - An instrument used for dispersing and recording specific wavelengths of the electromagnetic spectrum. Spectroscopy - The study of spectra. Speed of light - The speed at which light travelsQ300,000,000 meters per second. Supernova - A stellar explosion which increases the brightness of a star by a factor of several million times in a matter of days. Ultraviolet (UV) - Electromagnetic radiation with wavelengths ranging from |