X-ray astronomy is the study of astronomical objects at X-ray wavelengths. Typically, X-ray radiation is produced by synchrotron emission (the result of electrons orbiting magnetic field lines), therm ...
Ultraviolet astronomy refers to observations at ultraviolet wavelengths between approximately 100 and 3200 ? (10 to 320 nm). Light at these wavelengths is absorbed by the Earth's atmosphere, so obser ...
Historically, optical astronomy, also called visible light astronomy, is the oldest form of astronomy. Optical images of observations were originally drawn by hand. In the late 19th century and most o ...
Infrared astronomy is founded on the detection and analysis of infrared radiation (wavelengths longer than red light). The infrared spectrum is useful for studying objects that are too cold to radiate ...
Radio astronomy studies radiation with wavelengths greater than approximately one millimeter. Radio astronomy is different from most other forms of observational astronomy in that the observed radio w ...
In astronomy, the main source of information about celestial bodies and other objects is visible light or more generally electromagnetic radiation. Observational astronomy may be divided according to ...
During the Renaissance, Nicolaus Copernicus proposed a heliocentric model of the solar system. His work was defended, expanded upon, and corrected by Galileo Galilei and Johannes Kepler. Galileo innov ...
In early times, astronomy only comprised the observation and predictions of the motions of objects visible to the naked eye. In some locations, such as Stonehenge, early cultures assembled massive art ...
Generally, either the term "astronomy" or "astrophysics" may be used to refer to this subject. Based on strict dictionary definitions, "astronomy" refers to "the study of objects and matter outside th ...
Astronomy (from the Greek words astron (?στρον), "star" and -nomy from nomos (ν?μο?), "law" or "culture") means "law of the stars" (or "culture of the stars" depending on the translation). ...
Astronomy is a natural science that is the study of celestial objects (such as moons, planets, stars, nebulae, and galaxies), the physics, chemistry, and evolution of such objects, and phenomena that ...
