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Astronomy basics

2MASS
Astronomical survey of the whole sky in the infrared
Amateur astronomy
Hobby of watching the sky and stars
Astrobiology
Science concerned with life in the universe
Astrochemistry
The study of molecules in the Universe and their reactions
Astronomer
One who studies celestial bodies and space
Astronomical object
Natural physical entity in space
Astronomy
Scientific study of celestial objects and phenomena
Astrophotography
Astronomical imaging
Astrophysics
Branch of astronomy
Astrophysics Data System
Digital Library portal operated by the Smithsonian
Computational astrophysics
Methods and computing tools developed and used in astrophysics research
Cosmochemistry
Study of the chemical composition of matter in the universe and the processes that led to those compositions
Cosmology
The scientific study of the origin, evolution, and eventual fate of the universe
Extraterrestrial intelligence
Intelligent extraterrestrial life
Extraterrestrial life
Hypothetical life that does not originate on Earth
Fermi paradox
Discrepancy of the lack of evidence for alien life despite its apparent likelihood
Gravitational-wave astronomy
Type of astronomy involving observation of gravitational waves
Great Filter
Whatever prevents interstellar civilisations from arising from non-living matter
Hypothetical types of biochemistry
Possible alternative biochemicals used by life forms
Interstellar object
Astronomical object not gravitationally bound to a star
List of interstellar and circumstellar molecules
Molecules detected in space
Messier object
Astronomical objects catalogued by Charles Messier
NASA/IPAC Extragalactic Database
Astronomical database
Neutrino astronomy
Observational astronomy that benefits from the direct, or indirect, detection of neutrinos
New General Catalogue
Astronomical catalogue of deep sky objects
Night sky
Appearance of the sky in a clear night
Search for extraterrestrial intelligence
Effort to find civilizations not from Earth
SIMBAD
Astronomical database
Sloan Digital Sky Survey
Multi-spectral imaging and spectroscopic redshift survey
Space physics
Study of plasmas that occur naturally in the universe
Substellar object
Astronomical object with insufficient mass to sustain nuclear fusion
Theoretical astronomy
Use of the analytical models of physics and chemistry to describe astronomical objects and astronomical phenomena
Time-domain astronomy
Study of how astronomical objects change with time
Uppsala General Catalogue
Catalogue of galaxies visible from the northern hemisphere
VizieR
Astronomy objects catalog