(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.

plural of astronomical unit

(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.

plural of astronaut

pertaining or relating to astronomy / (figuratively) of very large or immense proportions; colossal

Navigation through space. / The science and technology of spaceflight.

Of or pertaining to astronautics.

plural of astronomer