Answer to Question 1
Shapley began his research on the star system by noticing that, although open star clusters are scattered all along the Milky Way, more than half of all globular clusters lie in or near the constellation Sagittarius. The globular clusters seem to be distributed in a great cloud with a center located in the direction of Sagittarius. Shapley assumed that the orbital motion of these clusters is controlled by the gravitation of the entire star system, and for that reason he concluded that the center of the star system must lie somewhere toward Sagittarius.
Answer to Question 2
Zero Age Main Sequence
The primary structure of ribonuclease
Nose, nasal cavity, and pharynx: (A) nasal cartilages and external structure; (B) meatus and positio
Structure of the F0F1 complex
The chemical structure of the water molecule facilitates life
What is the expanded structure of D-fructose
Transfer RNA structure