Cepheids and globular clusters are limited in their ability to measure the distance to galaxies because they ____.
a. are too rare
b. are not bright enough to detect at large distances
c. behave differently in other galaxies than they do in our own
d. do not appear in dwarf galaxies
e. are only found in elliptical galaxies
Question 2
What telescope instrument is used to counter the eastward rotation of Earth?
a. Newtonian focus
b. sidereal drive
c. active optics
d. Cassegrain focus
e. floppy mirrors
Local and long–distance cell communication in animals.
Galaxies Forming by Combining Smaller Units
The ability to roll the tongue is one of several traits that represent the dominant allele.
The positive correlation between the ability of various neuroleptics to bind to D2 receptors and ...
Contributions to the free energy of folding of globular proteins
Venn diagram representation of 17,067 medium and large clusters of protein