Topic 16 - Cosmology

• Hubble discovered that galaxies were receding from us by measuring their redshift (the shift to longer wavelengths)
•  the object showing the red light is moving away from the observer. These objects are said to show a...?

  redshift
• what is blueshift?


  the shift in wavelengths of light toward the blue end of the spectrum as an object moves toward us in space
• give an example of a galaxy that is showing blueshift?

  Andromeda