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The star cluster Omega Centauri, which is about 16,000 light-years from Earth.
Photo courtesy of Goddard Photo and Video Blog. CC BY.
 
Blueshift: shift in absorption bands towards the blue (short wavelength) end of the spectrum. Occurs when light moves towards the observer

Cosmic Microwave Background Radiation: radiation left over from the creation of the universe

Doppler Effect: change in wavelength caused by motion

Electromagnetic Spectrum: collection of all radiation, visible and invisible

Redshift: shift in absorption bands towards the red end of the spectrum (long wavelength). Occurs when light moves away from the observer

Scientific Notation: way to express very large or very small numbers

Spectrum: range of colors in the rainbow

After you have completed this part of the lesson, you can check the box for this lesson piece in the course to mark it as complete   

Last modified: Monday, 23 June 2014, 4:08 PM