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

Author Question: The__________is a theory that proposed to account for spiral arms as compressions of the ... (Read 26 times)

biggirl4568

  • Hero Member
  • *****
  • Posts: 551
on: Jul 27, 2018
The__________is a theory that proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy.
 
  A) spiral relativity theory
  B) spiral density wave theory
  C) spiral tracer theory
  D) spiral arm theory

Question 2

In 1912, after studying a star cloud called the Small Magellanic Cloud, Henrietta Leavitt concluded that:
 
  A) stars are eternal and unchanging.
  B) the brightest stars have the shortest pulsation periods.
  C) the Sun and Earth are near the edge of our Galaxy.
  D) there was a relationship between pulsation periods and luminosities of stars.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

sylvia

  • Sr. Member
  • ****
  • Posts: 331
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

D


biggirl4568

  • Member
  • Posts: 551
Reply 2 on: Jul 27, 2018
Gracias!

juliaf

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

The anatomical position: standing erect, gazing straight ahead, arms down at sides, palms facing for The anatomical position: standing erect, gazing straight ahead, arms down at sides, palms facing for
Robert Smithson, Spiral Jetty. Robert Smithson, Spiral Jetty.
Contact theory indicates that prejudice decreases and relations improve when individuals of ... Contact theory indicates that prejudice decreases and relations improve when individuals of ...
Oil is sent to the rocker arms on this Chevrolet V-8 engine through the hollow pushrods. The oil ... Oil is sent to the rocker arms on this Chevrolet V-8 engine through the hollow pushrods. The oil ...
Kneeling on one knee to keep good alignment when massaging the arms and hands. Kneeling on one knee to keep good alignment when massaging the arms and hands.
Proposed structure for keratin-type intermediate filaments Proposed structure for keratin-type intermediate filaments
Video: Introduction to Epilepsy

For a complete list of videos, visit our video library