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Retarding Force
- the phenomenon of resistance to motion through a fluid
- the phenomenon of resistance to motion through a fluid
Resolving Power
- the ability of a microscope or telescope to measure the angular separation of images that are close together
- the ability of a microscope or telescope to measure the angular separation of images that are close together
Red Shift
- (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
- (astronomy) a shift in the spectra of distant galaxies toward longer wavelengths; generally interpreted as the Doppler effect resulting from the velocity at which they recede as the universe expands
Redshift
- (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
Redshifts
- (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
Roentgen Ray
- electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
- electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
Resting Spore
- a spore of certain algae or fungi that lies dormant; may germinate after a prolonged period
Rosid Dicot Family
- a family of dicotyledonous plants
- a family of dicotyledonous plants
Rosid Dicot Genus
- a genus of dicotyledonous plants
- a genus of dicotyledonous plants
Rocky Mountain Pinon
- small compact two-needled pinon of southwestern United States; important as a nut pine