The entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

the rate of transfer of energy across a given surface

a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.

A range of electromagnetic radiation situated outside the visible spectrum at its red end used of radiation having a wavelength between about 700 nm and 1 mm

a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; with frequencies between 300 MHz (1 m) and 300 GHz (1 mm).

A type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz (Hz)

States that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the black-body radiant emittance) is directly proportional to the fourth power of the black body's thermodynamic temperature

a range of electromagnetic radiation situated beyond the visible spectrum at its violet end used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays

situated in the region of the electromagnetic spectrum perceptible to human vision used of radiation having a wavelength between about 400 nanometers and 700 nanometers

states that the black-body radiation curve for different temperatures will peak at different wavelengths that are inversely proportional to the temperature.

range of the electromagnetic spectrum that has an extremely short wavelength of less than 100 angstroms and have the properties of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, and of acting on photographic films and plates as light does

a type of optical telescope that uses a lens as its objective to form an image

a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.

A usually tubular optical instrument for viewing distant objects by means of the refraction of light rays through a lens or the reflection of light rays by a concave mirror

a type of reflecting telescope invented by the English scientist Sir Isaac Newton using a concave primary mirror and a flat diagonal secondary mirror.

a telescope that has a parabolic primary mirror and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary

A telescope designed to operate in space, usually outside the range of visible light