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.
This jumping spider's main ocelli (center pair) are very acute.
Spider's main organs
Post–Main-Sequence Evolution of Low-Mass Stars
Alternative methods for locating the CPT Main Term.
Venn diagram representation of 17,067 medium and large clusters of protein
Main body cavities that hold human organs