« previous next »

Author Question: Relate the Galaxy's spiral arms to the spiral-density wave theory. What will be an ideal ... (Read 189 times)

2125004343

  • Hero Member
  • *****
  • Posts: 566
on: Jul 27, 2018
Relate the Galaxy's spiral arms to the spiral-density wave theory.
 
  What will be an ideal response?

Question 2

At what core temperature does hydrogen begin to fuse to helium?
 
  A) 3,000 K
  B) 5,800 K
  C) 1 million K
  D) 10 million K
  E) 100 million K


lindahyatt42

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 27, 2018
Answer to Question 1

Spiral-density waves compress the gas and dust and lead to new star formation, making these regions of higher density bright and blue with new stars. The wave motion is slower than the rotation, and not tied to it, so it can keep going for billions of years.

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

2125004343

  • Hero Member
  • *****
  • Posts: 566
Reply #2 on: Jul 27, 2018
Thank you!


lindahyatt42

  • Sr. Member
  • ****
  • Posts: 322
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Theory of Mind Theory of Mind
The Systems in Bronfenbrenner’s Ecological Theory The Systems in Bronfenbrenner’s Ecological Theory
After lowering the vehicle, be sure all arms of the lift are moved out of the way before driving the ... After lowering the vehicle, be sure all arms of the lift are moved out of the way before driving the ...
Wave Refraction Wave Refraction
Physics - Density, Pressure, and Pascal's Principle Physics - Density, Pressure, and Pascal's Principle
Video: Biological organic compounds

For a complete list of videos, visit our video library