« previous next »

Author Question: The location of the Galactic Center was first found by Harlow Shapley with A) radio emissions ... (Read 55 times)

dakota nelson

  • Hero Member
  • *****
  • Posts: 604
on: Jul 27, 2018
The location of the Galactic Center was first found by Harlow Shapley with
 
  A) radio emissions from Sagittarius A.
  B) RR Lyrae variables in the globular clusters.
  C) Cepheids of population I in the spiral arms.
  D) infrared observations of the heat from its accretion disk around the black hole.
  E) planetary nebulae in the open clusters.

Question 2

Which of these variable stars would be classified as a Cepheid?
 
  A) a G giant with a period of 14 hours
  B) a B supergiant with a period of 0.14 days
  C) a K giant with a period of 14 days
  D) an F giant with a period of 14 years
  E) an M supergiant with a period of 140 days


jrpg123456

  • Sr. Member
  • ****
  • Posts: 317
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

Bow shock formed by the magnetosphere of LL Orionis (center) as it collides with the Orion Nebula fl Bow shock formed by the magnetosphere of LL Orionis (center) as it collides with the Orion Nebula fl
The Real Reason Why They Repeat the Same 20 Songs on the Radio & TV Nationwide The Real Reason Why They Repeat the Same 20 Songs on the Radio & TV Nationwide
On May 15, 1916, after deliberating for one hour, an all-white jury in Waco, Texas, found seventeen- On May 15, 1916, after deliberating for one hour, an all-white jury in Waco, Texas, found seventeen-
Projections of global temperature depend heavily on the level of future greenhouse gas emissions Projections of global temperature depend heavily on the level of future greenhouse gas emissions
The developed countries must reduce the level of greenhouse gas emissions The developed countries must reduce the level of greenhouse gas emissions
Location of brain lesions in Alzheimer disease. Plaques are concentrated most heavily in the amygdal Location of brain lesions in Alzheimer disease. Plaques are concentrated most heavily in the amygdal
Video: Brief Summary on Photosynthesis - Animation

For a complete list of videos, visit our video library