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

Author Question: Contrast the observed visible mass of the Galaxy with its suspected total. Explain the difference. ... (Read 42 times)

serike

  • Hero Member
  • *****
  • Posts: 542
on: Jul 27, 2018
Contrast the observed visible mass of the Galaxy with its suspected total. Explain the difference.
 
  What will be an ideal response?

Question 2

Compare the rotation of the stars and the spiral density wave pattern in our Galaxy. How is it observed?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jgranad15

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 27, 2018
Answer to Question 1

From the Sun inward, we measure about 100 billion solar masses from the speeds and distances of objects around us in the disk. But when the huge quantities of dark matter out beyond us in the halo is considered from the Galaxy's rotation curve, the dark matter adds up to enough to push the total to 600 billion Suns.

Answer to Question 2

The density wave moves slower than the stars do, based on the Doppler shifts of the stars compared to the gas and dust that forms the spiral arms.


serike

  • Member
  • Posts: 542
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

bitingbit

  • Member
  • Posts: 323
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

The enhancement effect observed by Emerson. The enhancement effect observed by Emerson.
Brain mass as a function of body mass in mammals. Brain mass as a function of body mass in mammals.
Prostate cancer. In this example, a large mass has grown into the urinary bladder. Prostate cancer i Prostate cancer. In this example, a large mass has grown into the urinary bladder. Prostate cancer i
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Dred Scott and his wife and children are featured on the cover of Frank Leslie’s Illustrated Newspap Dred Scott and his wife and children are featured on the cover of Frank Leslie’s Illustrated Newspap
Total allowable and actual catch, Grand Bank Atlantic Cod 1959 -2012 Total allowable and actual catch, Grand Bank Atlantic Cod 1959 -2012
Video: Epinephrine/NE (heart rate, altered blood flow, glycogenolysis & bronchodilation)

For a complete list of videos, visit our video library