Some globular clusters have three main sequence tracks. This indicates:
A) three different stellar compositions.
B) three episodes of star formation, separated by billions of years.
C) stars evolve through three different mechanisms.
D) the stars were observed from three different telescopes.
Question 2
Compared to optical telescopes, radio telescopes are built large because:
A) they're less expensive to make than optical telescopes.
B) radio photons don't carry much energy.
C) atmospheric turbulence is more of a problem.
D) radio sources are harder to find.
E) radio waves are absorbed by the atmosphere.
Structure of the enzyme chymotrypsin, a globular protein
Evolution of Stars Off the Main Sequence
An H-R Diagram of a Globular Cluster
Identify the Main Term
The main avenue to the upward social mobility reviewed in the text has been higher education.
Mass spectrometry (MS) for Mass, Sequence, and Amino Acid Analyses of Purified Proteins