Physics College

Given that Shapley calculated the size of the Milky Way based on the stars' apparent brightness, how did not including the effects of gas and dust affect Shapley's calculation?
A. The distance calculated to each globular cluster was too large, and thus his size for the Milky Way was too small.
B. The distance calculated to each globular cluster was too large, and thus his size for the Milky Way was too large.
C. The distance calculated to each globular cluster was too small, and thus his size for the Milky Way was too large.
D. The distance calculated to each globular cluster was too small, and thus his size for the Milky Way was too small.Answer:B. The distance calculated to each globular cluster was too large, and thus his size for the Milky Way was too large.

Answers

Answer 1

The correct option is, The distance calculated to each globular cluster was too large, and thus his size for the Milky Way was too large.

What main conclusion did Shapley draw from his measurements of the distances to the globular clusters?
Shapley concluded (and other astronomers have since verified) that the center of the distribution of globular clusters is the center of the Milky Way as well, so our galaxy looks like a flat disk of stars embedded in a spherical cloud, or 'halo,' of globular clusters.

How did Shapley estimate the location of the Sun in the Milky Way?
Harlow Shapley determined the position of the Sun in the galaxy by measuring the distances to 93 globular clusters of stars.

What is a globular star cluster?
Globular clusters are stable, tightly bound clusters of tens of thousands to millions of stars. They are associated with all types of galaxies. Globular clusters are typically much larger than open clusters and are tightly gravitationally bound.

What are the characteristics of the stars in globular clusters?
Globular clusters are densely packed collections of ancient stars. Roughly spherical in shape, they contain hundreds of thousands, and sometimes millions, of stars. Studying them helps astronomers estimate the age of the universe or figure out where the center of a galaxy lies.

To know more about globular star clusters:
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