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
A comparison between chromosomes found in a normal human cell and a cancer cell from the same person
The oral cavity. Anterior view of the open mouth.
Off-Center Disk
Seyfert Galaxy NGC 1566
The proportion of men and women with elevated blood pressure or taking hypertension medication incre
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha