What other population of stars are relatively old?
A.) Open clusters.
B.) OB associations.
C.) Globular clusters.
D.) Blue clusters.
E.) Superclusters.
Ans: C.) Globular clusters.
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Process of Science: What evidence do scientists have that supermassive black holes exist?
What will be an ideal response?
Why do astronomers believe that there is a large black hole, around 4 million times the mass of our Sun, in the Galactic center?
What will be an ideal response?
A small hole is cut in the bottom of a water storage tank. The initial depth of the water is 12.00 m. If the diameter of the small hole in the bottom of the tank is 4.00 mm, then what is the flow rate of the water leaving the tank?
a. 
b. 
c. 
d. 
e. 
Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet. b. the result of the melting and vaporizing of the glaciers from the last ice age. c. composed primarily of hydrogen and helium. d. composed of gases that were outgassed from the heated rocks sometime after the planet formed. e. the result of a collision between the sun and another star.