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- Algenib [r]: Star in the lower left-hand corner of the Great Square of Pegasus. [e]
- Andromeda Galaxy [r]: Nearest large spiral galaxy to the Milky Way, also known as Messier 31 [e]
- Antares [r]: The brightest star in the constellation of Scorpius and the sixteenth brightest star in the nighttime sky. [e]
- Anthropology [r]: The holistic study of humankind; from the Greek words anthropos ("human") and logia ("study"). [e]
- Apple (fruit) [r]: A tree fruit of the plant Malus pumila, commonly used in cooking, or eaten raw. [e]
- Archaeology [r]: The scientific study of past human cultures by means of the recovery, documentation and analysis of material remains and environmental data. [e]
- Astrobiology [r]: The study of life in the universe. [e]
- Astrology [r]: Any belief that correlates the patterns and positions of celestial bodies to human personalities, human affairs, or terrestrial events. [e]
- Astronomy [r]: The study of objects and processes in the observable universe, e.g. stars, planets, comets or asteroids. [e]
- Astrophysics [r]: Hybrid of Physics and Astronomy that attempts to explain the physical workings of the celestial objects and phenomena. [e]
- Atmosphere [r]: The layers of gas surrounding stars and planets. [e]
- Aurora Borealis [r]: Visible light stimulated by the interaction of the solar wind and the upper atmosphere, around the North Magnetic Pole. [e]
- Big Bang [r]: A cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature. [e]
- Black hole [r]: Area of space-time with a gravitational field so intense that its escape velocity is equal to or exceeds the speed of light. [e]
- COBE (astronomy) [r]: Satellite dedicated to cosmology, launched in 1989 to investigate the cosmic microwave background radiation of the universe and provide measurements that would help shape our understanding of the cosmos. [e]
- Dark matter [r]: Theoretical matter that neither emits nor absorbs light and appears to interact with other matter only gravitationally. [e]
- Enceladus [r]: The sixth-largest moon of Saturn. [e]
- Galaxy rotation curve [r]: Graph of a galaxies curve, represented by a plot of the orbital velocity of the stars or gas in the galaxy on the y-axis against the distance from the center of the galaxy on the x-axis. [e]
- Galaxy [r]: Gravitationally bound system of stars typically contain ten million to one trillion stars. [e]
- Geophysics [r]: The study of the Earth by quantitative physical methods, namely seismic, magnetic, electrical, electromagnetic, thermal and radioactivity methods. [e]
- Globular cluster [r]: Spherical, globular collection of stars that orbits a galactic core as a satellite, and is generally smaller in size than a galaxy. [e]
- Gravitational lens [r]: A lens formed when light from a very distant, bright source (such as a quasar) is 'bent' around a massive object (such as a cluster of galaxies) between the source object and the observer. [e]
- International Astronomical Union [r]: Internationally recognized authority for assigning designations to celestial bodies (stars, planets, asteroids, etc), headquartered in Paris, France. [e]
- International Olympiad of Astronomy and Astrophysics [r]: Annual astronomy contest for high school students from across the world. [e]
- International Ultraviolet Explorer [r]: An astronomical satellite designed primarily to observe ultraviolet spectra. [e]
- Magnetic field [r]: Vector field H caused by permanent magnets, conduction currents, and displacement currents. [e]
- Magnitude (astronomy) [r]: Logarithmic measure of the brightness of an object, measured in a specific wavelength or passband, usually in optical or near-infrared wavelengths. [e]
- Mars (planet) [r]: The fourth planet from the Sun in our solar system; named after the Roman god of war; also known as the "Red Planet". [e]
- Mass [r]: The total amount of a substance, or alternatively, the total energy of a substance. [e]
- Microbiology [r]: The study of microorganisms (overlapping with areas of virology, bacteriology, mycology, and parasitology). [e]
- Microorganism [r]: A 'germ', an organism that is too small to be seen individually with the naked eye. [e]
- Milky Way [r]: The Milky Way galaxy which contains our solar system. [e]
- Nova (astronomy) [r]: A star that increases rapidly in brightness; there are two main types: ordinary novae, and supernovae, which are much bigger and rarer. [e]
- Olber's paradox [r]: Argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. [e]
- Organic chemistry [r]: The scientific study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of chemical compounds of carbon and hydrogen, which may contain any number of other elements. [e]
- Parallax [r]: the apparent change in the position of an object resulting from a change in position of the observer. [e]
- Planet [r]: A cosmic body orbiting a star. [e]
- Ptolemy [r]: (2nd century AD) Egyptian astronomer and geographer whose main work, the Almagest, a compendium of contemporary astronomical knowledge, was in use into the 15th century. [e]
- Red dwarf (star) [r]: Small and relatively cool star, of low luminosity, being in the main sequence either late K or M spectral type. [e]
- Renaissance [r]: Cultural movement that spanned roughly the 14th to the 17th century, beginning in Florence in the Late Middle Ages and later spreading to the rest of Europe. [e]
- Roman Empire [r]: The period from the ascension of Augustus Caesar to the fall of the Empire. [e]
- Science [r]: The organized body of knowledge about the physical world derived from the activities of observation and experimentation. [e]
- Scorpius [r]: Constellation in the Southern Hemisphere near Libra and Sagittarius, containing the bright red star Antares, and the eighth member of the zodiac, its name is Latin for 'scorpion'. [e]
- Solar system [r]: The sun and the planets orbiting it. [e]
- Sputnik [r]: Series of robotic spacecraft missions launched by the Soviet Union, the first of these, Sputnik 1, launched the first human-made object to orbit the Earth, which took place on 4 October 1957. [e]
- Stellar classification (astrophysics) [r]: The categorization of stars by various properties. [e]
- Sunshine (2007 film) [r]: Add brief definition or description
- Sun [r]: The star that defines our solar system. [e]
- Tycho Brahe [r]: Danish astronomer of the 16th century. [e]
- Universe [r]: The summation of all particles and energy that exist and the space-time in which all events occur. [e]
- Uranium [r]: A silvery-white metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. [e]
- Variable star [r]: A star whose apparent brightness exhibits periodic variations [e]
- Visible light [r]: Electromagnetic radiation of a wavelength that is detectable by the human eye. [e]
- Week [r]: Time unit equal to a number of days, now usually seven calendar days, previously weeks of between 4 and 20 days have been used historically in various places. [e]
- Wolf 359 (star) [r]: Red dwarf star of absolute magnitude 16.6, it is 7.8 light-years from the sun and is a variable flare star, which may emit bursts of light and even radio noise. [e]
- Year [r]: A unit of time measurement that corresponds to one revolution of the earth around the sun, approximately 365ΒΌ days. [e]
- Zeus [r]: chief-god in the ancient Greek Mythology [e]
