Shapley found the distance to the center of the galaxy by studying the distance to open clusters.
a. True
b. False
Indicate whether the statement is true or false
Question 2
A ZAMS star evolves __________ and to the __________ on the H-R diagram because ________________.
a. downward, left, the core expands which causes the outer layers to expand b. upward, right, the core contracts which causes the outer layers to expand
c. upward, left, the core expands which causes the outer layers to contract d. downward, right, the core contracts which causes the outer layers to contract
Juvenile American alligator swimming, showing the distinctive yellow striping found on juveniles
The Pleiades, an open cluster of stars in the constellation of Taurus.
Ultraviolet mosaic of Mira's bow shock and tail obtained using NASA's Galaxy Evolution Exp
Jane Goodall pioneered the modern approach to studying primates in the wild, involving close-up obse
Capuchins use stones to crack open palm nuts in much the same way that chimpanzees in some populatio
Amino acids not found in proteins