When astronomers first started analyzing spectra, they had
to work through the same task you just completed. They looked
for small similarities and differences among spectra. By comparing
hundreds of spectra, astronomers eventually identified a limited
number of spectral patterns, and they used these general patterns
to categorize all spectra.
Categorize the spectra again. This time, place them in one of the columns based on similarities with the standard stars at the top of each column. Use similar patterns in the locations and widths of absorption lines to place each spectrum.
! Click and drag the spectra to place them in the appropriate column, then answer question number 3 below.