This topic contains a solution. Click here to go to the answer

Author Question: Changing minds: From the time the idea of dark matter was first proposed in the 1930s, it took ... (Read 147 times)

azncindy619

  • Hero Member
  • *****
  • Posts: 562
Changing minds: From the time the idea of dark matter was first proposed in the 1930s, it took nearly 50 years for astronomers to universally accept the existence of dark matter. Discuss the process by which that acceptance came about.
 
  What evidence was collected, and how was it checked?

Question 2

Order the interior layers of the Sun from the hottest to the coldest.
 
  A) radiation zone, core, convection zone, photosphere
  B) photosphere, convection zone, core, radiation zone
  C) core, radiation zone, convection zone, photosphere
  D) photosphere, convection zone, radiation zone, core



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Awesome

  • Sr. Member
  • ****
  • Posts: 280
Answer to Question 1

The idea was first proposed as an explanation for how galaxies in clusters had such high speeds relative to each other yet did not fly apart. Later astronomers also found that there was some unseen source of mass within spiral galaxies  the speed at which stars orbit does not drop off with distance, as would be expected if the only source of gravity was the stars and gas. A source of unseen mass in galaxies was further confirmed by measuring the high-speed random orbits of stars in elliptical galaxies. Dark matter in galaxy clusters was confirmed by the discovery of very high temperature intracluster gas (heated by moving under the influence of large amounts of unseen matter), and by gravitational lensing of clusters. It was only after the idea of dark matter was used to explain several more phenomena that it became generally accepted.

Answer to Question 2

C




azncindy619

  • Member
  • Posts: 562
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it


emsimon14

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Gracias!

 

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

For a complete list of videos, visit our video library