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

Author Question: What factors are important when trying to classify a spiral galaxy? a. amount of dust and gas in ... (Read 16 times)

lracut11

  • Hero Member
  • *****
  • Posts: 536
on: Jul 27, 2018
What factors are important when trying to classify a spiral galaxy?
 
  a. amount of dust and gas in the galaxy
  b. structure of the spiral arms
  c. size of the central region
  d. All of the other choices are important.

Question 2

Why are reflection nebulae blue in color?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Viet Thy

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 27, 2018
Answer to Question 1

d

Answer to Question 2

Reflection nebulae look blue for the same reason the sky looks blue. Short wavelengths scatter more easily than long wavelengths, so blue photons are scattered. The blue color shows that the dust particles must be very small to preferentially scatter blue photons.


lracut11

  • Member
  • Posts: 536
Reply 2 on: Jul 27, 2018
Excellent

jackie

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

The FDA recognizes 118 routes of administration.

Did you know?

Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Checking teeth and other physical examinations are an important part of horse care. Checking teeth and other physical examinations are an important part of horse care.
Important Human Viral Table Important Human Viral Table
Spiral Galaxies Seen Nearly Edge On from the Milky Way Spiral Galaxies Seen Nearly Edge On from the Milky Way
Factors Affecting the Environmental Lapse Rate (ELR): Heating or Cooling of the Lower Atmosphere Factors Affecting the Environmental Lapse Rate (ELR): Heating or Cooling of the Lower Atmosphere
Major Risk Factors for Hypertension Major Risk Factors for Hypertension
Enlargement of spiral organ (organ of Corti) Enlargement of spiral organ (organ of Corti)
Video: Male Reproductive System - The gonadotropin releasing hormone

For a complete list of videos, visit our video library