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In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation. The opposite change, a decrease in wavelength and increase in frequency and energy, is known as a blueshift, or negative redshift. The terms derive from the colours red and blue which form the extremes of the visible light spectrum. The main causes of electromagnetic redshift in astronomy and cosmology are the relative motions of radiation sources, which give rise to the relativistic Doppler effect, and gravitational potentials, which gravitationally redshift escaping radiation. All sufficiently distant light sources show cosmological redshift corresponding to recession speeds proportional to their distances from Earth, a fact known as Hubble's law that implies the universe is expanding.
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References
- 1 2 "Anna M. Quider", Authors, American Physical Society, retrieved 2023-11-04
- ↑ "Stars favor science whiz: Grand Islander gets British astrophysics scholarship", Buffalo News, 21 December 2006, retrieved 2023-11-04
- ↑ Anna Quider, Society of Physics Students, retrieved 2023-11-04
- ↑ Chambliss Astronomy Achievement Student Awards, American Astronomical Society, retrieved 2024-06-18
- 1 2 3 "Anna Quider honored twice over for outstanding federal relations achievements", NIU Today, 17 November 2022, retrieved 2023-11-04
- ↑ Quider, Anna Marie (2007), High redshift star-forming galaxies in absorption and emission (Doctoral dissertation), University of Cambridge, doi:10.17863/CAM.15995, hdl:1810/239408
- ↑ Matthews, Jermey N. A. (January 2012), "Science fellows find policy 'a perfect fit'", Physics Today, 65 (1): 24–25, doi:10.1063/pt.3.1396
- ↑ "Fellows nominated in 2021 by the Forum on Physics and Society", APS Fellows archive, American Physical Society, retrieved 2023-11-04