An astronomer studies a galaxy that is far away. The table indicates how the galaxy’s distance and its recession speed are found. Which row is correct?
- Adistance: brightness of a supernova in the galaxy; speed of recession: change in wavelength of starlight from the galaxy
- Bdistance: brightness of a supernova in the galaxy; speed of recession: brightness of the galaxy
- Cdistance: brightness of the galaxy; speed of recession: change in wavelength of starlight from the galaxy
- Ddistance: brightness of the galaxy; speed of recession: brightness of a supernova