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 138 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
Excellent


kjohnson

  • Member
  • Posts: 330
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Did you know?

Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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?

Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

For a complete list of videos, visit our video library