The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe. / (obsolete) Astrology.

plural of astronomy

(astronomy) the astronomical observation and study of objects, cooler than most stars, using the infrared part of the electromagnetic spectrum

(astronomy) The detection and study of neutrinos, in order to investigate astronomical objects and the universe.

(astronomy) A technique that uses radar echoes to examine bodies within the solar system, obtaining information about size, shape, topography, surface density, spin etc.

The branch of astronomy which utilizes radio waves through the use of radio telescopes to study celestial bodies and occurrences.

(astronomy) An observational branch of astronomy, which deals with the study of ultraviolet emission from celestial objects.

(informal) Astronomy using observations using telescopes and recording media that capture visible light. / (astronomy) Astronomy using infrared, visible, and/or ultraviolet wavelengths.

(astronomy) An observational branch of astronomy, which deals with the study of X-ray emission from celestial objects.

(astronomy) An observational branch of astronomy, which deals with the study of gamma-ray emission from celestial objects.