This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which of the following is true of O and B stars? A) Their parallax is too small to measure. B) ... (Read 91 times)

asan beg

  • Hero Member
  • *****
  • Posts: 570
on: Jul 27, 2018
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
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

A


asan beg

  • Hero Member
  • *****
  • Posts: 570
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


yasmin

  • Sr. Member
  • ****
  • Posts: 319
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Small Munsterländer Small Munsterländer
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Primates in the New World tend to be small-bodied compared to those elsewhere. Primates in the New World tend to be small-bodied compared to those elsewhere.
Parasitic Hookworms in the small intestine Parasitic Hookworms in the small intestine
Fine motor skills involve coordinating the many small muscles of the wrists, hands, and fingers. Fine motor skills involve coordinating the many small muscles of the wrists, hands, and fingers.
Small local hydroelectric power generators have more future potential Small local hydroelectric power generators have more future potential
Video: baroreceptors

For a complete list of videos, visit our video library