« previous next »

Author Question: Relate the Galaxy's spiral arms to the spiral-density wave theory. What will be an ideal ... (Read 170 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?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Seyfert Galaxy NGC 1566 Seyfert Galaxy NGC 1566
Richard Wrangham’s “female-bonded” theory of intergroup competition was highly influential in our un Richard Wrangham’s “female-bonded” theory of intergroup competition was highly influential in our un
ECG Wave Patterns ECG Wave Patterns
Contact theory indicates that prejudice decreases and relations improve when individuals of ... Contact theory indicates that prejudice decreases and relations improve when individuals of ...
Wave-Cut Platform and Marine Terrace Wave-Cut Platform and Marine Terrace
The James-Lange Theory of Emotion The James-Lange Theory of Emotion
Video: Flexor reflex & Crossed extensor reflex

For a complete list of videos, visit our video library