Author Question: The location of the Galactic Center was first found by Harlow Shapley with A) radio emissions ... (Read 83 times)

dakota nelson

  • Hero Member
  • *****
  • Posts: 604
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
Answer to Question 1

B

Answer to Question 2

C



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

For a complete list of videos, visit our video library