58 relations: Accretion disk, Active galactic nucleus, Aqua (color), Astronomical spectroscopy, Astronomy, Atomic physics, Binary star, Black hole, Blue, Bohr model, Calcium, Doppler effect, Electromagnetic spectrum, Electron, Emission nebula, Empirical evidence, Exoplanet, Fine structure, Fraunhofer lines, Galaxy cluster, H II region, H-alpha, Helium, Hydrogen, Hydrogen atom, Hydrogen spectral series, Johann Jakob Balmer, Johannes Rydberg, Joseph von Fraunhofer, Kelvin, Light, Lyman series, National Institute of Standards and Technology, Nebula, Neutron star, Orion Nebula, Photon, Planetary nebula, Principal quantum number, Quasar, Radial velocity, Red, Redshift, Rydberg constant, Rydberg formula, Spectral line, Spectroscopy, Spectrum, Star, Star cluster, ..., Stellar classification, Stellar kinematics, Surface gravity, Theoretical and experimental justification for the Schrödinger equation, Ultraviolet, Universe, Visible spectrum, Wavelength. Expand index (8 more) » « Shrink index
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.
Aqua (from aqua for water) is a greenish-blue color, a variation of the color cyan.
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other celestial objects.
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus.
A binary star is a star system consisting of two stars orbiting around their common barycenter.
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.
Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model.
In atomic physics, the Rutherford–Bohr model or Bohr model or Bohr diagram, introduced by Niels Bohr and Ernest Rutherford in 1913, depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus—similar to the structure of the Solar System, but with attraction provided by electrostatic forces rather than gravity.
Calcium is a chemical element with symbol Ca and atomic number 20.
The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths.
Empirical evidence, also known as sensory experience, is the information received by means of the senses, particularly by observation and documentation of patterns and behavior through experimentation.
An exoplanet or extrasolar planet is a planet outside our solar system.
In atomic physics, the fine structure describes the splitting of the spectral lines of atoms due to electron spin and relativistic corrections to the non-relativistic Schrödinger equation.
In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826).
A galaxy cluster, or cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity with typical masses ranging from 1014–1015 solar masses.
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized.
H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air; it occurs when a hydrogen electron falls from its third to second lowest energy level.
Helium (from lit) is a chemical element with symbol He and atomic number 2.
Hydrogen is a chemical element with symbol H and atomic number 1.
A hydrogen atom is an atom of the chemical element hydrogen.
The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula.
Johann Jakob Balmer (1 May 1825 – 12 March 1898) was a Swiss mathematician and mathematical physicist.
Johannes (Janne) Robert Rydberg (8 November 1854 – 28 December 1919) was a Swedish physicist mainly known for devising the Rydberg formula, in 1888, which is used to describe the wavelengths of photons (of light and other electromagnetic radiation) emitted by changes in the energy level of an electron in a hydrogen atom.
Joseph Ritter von Fraunhofer (6 March 1787 – 7 June 1826) was a Bavarian physicist and optical lens manufacturer.
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
In physics and chemistry, the Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n.
The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.
A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion.
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
In quantum mechanics, the principal quantum number (symbolized n) is one of four quantum numbers which are assigned to all electrons in an atom to describe that electron's state.
A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).
The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.
Red is the color at the end of the visible spectrum of light, next to orange and opposite violet.
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
The Rydberg constant, symbol R∞ for heavy atoms or RH for hydrogen, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to atomic spectra, in the science of spectroscopy.
The Rydberg formula is used in atomic physics to describe the wavelengths of spectral lines of many chemical elements.
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
Spectroscopy is the study of the interaction between matter and electromagnetic radiation.
A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
Star clusters are groups of stars.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
The surface gravity, g, of an astronomical or other object is the gravitational acceleration experienced at its surface.
The theoretical and experimental justification for the Schrödinger equation motivates the discovery of the Schrödinger equation, the equation that describes the dynamics of nonrelativistic particles.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
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