#stellar

• Astronomer — A scientist or highly qualified specialist in astronomy; a researcher who deals with the observation, measurement, cataloging, and physico-mathematical interpretation of the positions, movements, composition, and evolution of celestial bodies and matter in the universe. Their activity involves utilizing advanced optical instruments, radio telescopes, or satellite data to study cosmic phenomena, from nearby asteroid orbits to the structure of distant galaxies.
• Astronomer — A woman who works as an astronomer; a female specialist or researcher in astronomy who deals with the study of the structure, positions, and evolution of celestial bodies. She uses physico-mathematical models and high-power optical or electronic instruments to document phenomena in the universe, making an essential contribution to fields such as spectral analysis or exoplanet discovery.
• Astronomy — A fundamental and natural science that deals with the study, observation, measurement, and physico-mathematical interpretation of celestial bodies (stars, planets, satellites, comets, asteroids, galaxies), cosmic structures, and the universe as a whole. This discipline investigates the origin, evolution, chemical composition, and motion dynamics of matter and energy in extra-atmospheric space, being one of the oldest branches of human knowledge.
• Astrosphere — A bubble-like region of space surrounding a star, continuously generated and maintained by the stream of plasma ejected by that star (the stellar wind) and its magnetic field. This dynamic structure acts as a protective shield against interstellar dust and high-energy cosmic rays, extending up to the astropause, where the stellar wind pressure balances that of the surrounding interstellar medium; the heliosphere is the specific astrosphere of our Sun.
• Astrospectroscopy — A fundamental field of astrophysics dealing with the qualitative and quantitative study of the electromagnetic radiation spectra emitted or absorbed by celestial bodies. This discipline analyzes spectral lines decomposed via diffraction gratings or prisms to deduce the chemical composition, effective temperature, surface gravity, radial velocity, and rotational motions of cosmic objects in the universe.
• Baade — A proper surname of German origin, predominantly associated in scientific contexts with the astronomer Wilhelm Heinrich Walter Baade (1893–1960). His foundational contributions include defining the two distinct stellar populations (Population I and Population II), recalibrating cosmic distances by revising the Cepheid period-luminosity relation, and discovering major asteroids, with his name being given to the lunar crater Baade, asteroid 1501 Baade, and an observational window toward the galactic center.