This topic contains a solution. Click here to go to the answer

Author Question: Which of the following is true of O and B stars? A) Their parallax is too small to measure. B) ... (Read 72 times)

asan beg

  • Hero Member
  • *****
  • Posts: 570
Which of the following is true of O and B stars?
 
  A) Their parallax is too small to measure.
  B) They are not found in associations.
  C) They reveal parts of six spiral arms near the Sun.
  D) Their distances cannot be measured by spectroscopic parallax.

Question 2

The mass of the Milky Way Galaxy can be estimated by:
 
  A) the orbital motions of the stars within the galaxy.
  B) the mass of the planets in the Solar System.
  C) the luminosity of the stars of the neighboring galaxies.
  D) the concept laid down by the spiral density wave theory.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yasmin

  • Sr. Member
  • ****
  • Posts: 319
Answer to Question 1

A

Answer to Question 2

A



asan beg

  • Hero Member
  • *****
  • Posts: 570
Both answers were spot on, thank you once again



yasmin

  • Sr. Member
  • ****
  • Posts: 319

 

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

Did you know?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

For a complete list of videos, visit our video library