Blue shift - Citizendia

For other uses, see Blue shift (disambiguation).

Physical cosmology

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Redshift and blue shift

Blue shift refers to a shortening of a transmitted signal's wavelength, and/or an increase in its frequency. Physical cosmology, as a branch of Astronomy, is the study of the large-scale structure of the Universe and is concerned with fundamental questions about its The Universe is defined as everything that Physically Exists: the entirety of Space and Time, all forms of Matter, Energy The Big Bang is the cosmological model of the Universe that is best supported by all lines of scientific evidence and Observation. The age of the Universe is the time elapsed between the theory of the Big Bang and the present day This timeline of the Big Bang describes the events according to the Scientific theory of the Big Bang, using the cosmological time parameter of Comoving coordinates The ultimate fate of the universe is a topic in Physical cosmology. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. Frequency is a measure of the number of occurrences of a repeating event per unit Time. The name comes from the fact that the shorter-wavelength end of the optical spectrum is the blue (or violet) end, hence, when visible light is compacted in wavelength, it is "shifted towards the blue", or "blue-shifted". A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary infinitely within a continuum. Blue is a Colour, the Perception of which is evoked by As the name of a color violet (named after the flower violet) is used in two senses first referring to the color of Light at the short- Wavelength Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700 Since the longer-wavelength end of the visible electromagnetic spectrum is red, the opposite effect, of a lengthening of a signal's wavelength, is referred to as redshifting. The electromagnetic (EM spectrum is the range of all possible Electromagnetic radiation frequencies Red is any of a number of similar Colors evoked by light consisting predominantly of the longest wavelengths of Light discernible by the human eye in the wavelength In Physics and Astronomy, redshift occurs when Electromagnetic radiation – usually Visible light – emitted or reflected by

These terms and conventions ("blue" = compaction, "red"=stretching) are used even when referring to signals outside the optical range (for instance, radio waves, x-rays and gamma rays). Radio waves are electromagnetic waves occurring on the Radio frequency portion of the Electromagnetic spectrum. X-radiation (composed of X-rays) is a form of Electromagnetic radiation. Gamma rays (denoted as &gamma) are a form of Electromagnetic radiation or light emission of frequencies produced by sub-atomic particle interactions . The term is also used informally to refer to a hypsochromic shift in photochemistry. Hypsochromic shift is a change of spectral band position in the absorption, Reflectance, Transmittance, or Emission spectrum of a molecule to Photochemistry, a sub-discipline of Chemistry, is the study of the interactions between Atoms, small Molecules, and light (or Electromagnetic radiation

1 Astronomy
- 1.1 Cause of blueshift in astronomy
- 1.2 Limit of blue shift
2 See also

Astronomy

Redshift is much more noted due to its importance to modern astronomy. In Physics and Astronomy, redshift occurs when Electromagnetic radiation – usually Visible light – emitted or reflected by Astronomy (from the Greek words astron (ἄστρον "star" and nomos (νόμος "law" is the scientific study While the general redshift of starlight is seen as evidence for an expanding universe, there are a few examples of blue shift in astronomy:

The Andromeda Galaxy is moving towards our own Milky Way Galaxy within the Local Group; thus, when observed from earth, its light is undergoing a blue shift. In Physics and Astronomy, redshift occurs when Electromagnetic radiation – usually Visible light – emitted or reflected by The Andromeda Galaxy (ænˈdrɒmədə also known as Messier 31, M31, or NGC 224; often referred to as the Great Andromeda The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Γαλαξίας (Galaxias sometimes referred to simply A galaxy is a massive gravitationally bound system consisting of Stars an Interstellar medium of gas and dust, and Dark matter The Local Group is the group of galaxies that includes our galaxy the Milky Way.
When observing spiral galaxies, the side spinning towards us will have a slight blue shift (see Tully-Fisher relation). In Astronomy, the Tully-Fisher relation, published by astronomers R
Also, Blazars are known to propel relativistic jets towards us, emitting synchrotron radiation and Bremsstrahlung that appears blue shifted. A blazar is a very compact and highly variable energy source associated with a presumed Supermassive black hole at the center of a Host galaxy. The lower-energy non-relativistic version of this phenomenon is described at Polar jet. This article concerns the physical phenomenon of synchrotron radiation Bremsstrahlung ( pronounced, from German de ''bremsen'' "to brake" and de ''Strahlung'' "radiation" i
Nearby stars such as Barnard's Star are moving towards us, resulting in a very small blue shift

Cause of blueshift in astronomy

These are the known possible causes of blue shift in astronomy:

Movement of the source towards us, as seen in
1. the edge of a rotating galaxy moving towards us
2. In blazars which propel relativistic jets towards us
3. Some galaxies [1] and quasars [2]
Gravitational effects. Barnard's Star ( is a very low-mass Red dwarf Star approximately 6 Light-years away in the Constellation of Ophiuchus (the A blazar is a very compact and highly variable energy source associated with a presumed Supermassive black hole at the center of a Host galaxy. This page is about the scientific concept of relativity for philosophical or sociological theories about relativity see Relativism. The lower-energy non-relativistic version of this phenomenon is described at Polar jet. See gravitational redshift

Limit of blue shift

See also: chronon

According to well accepted quantum theory, the limit of blue-shift is approached when a half-wavelength of light approaches the planck length. In Physics, Light or other forms of Electromagnetic radiation of a certain wavelength originating from a source placed in a region of stronger gravitational A chronon is a proposed Quantum of time that is a discrete and indivisible "unit" of time as part of a theory that proposes that time is not continuous The Planck length, denoted by \scriptstyle\ell_P \, is the unit of Length approximately 1 This corresponds to a half-wavelength of 1. 616x10^-35 meters, and a frequency of 9. 276x10^42 Hz (and defines a minimum period of 1. 078x10^-43 seconds, which therefore must be the minimum increment of time in the universe). The Universe is defined as everything that Physically Exists: the entirety of Space and Time, all forms of Matter, Energy

Contents

Astronomy

Cause of blueshift in astronomy

Limit of blue shift

See also