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 73 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
Great answer, keep it coming :)

vickybb89

  • Member
  • Posts: 347
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

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?

Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Ochem molecule contrast chart Ochem molecule contrast chart
Total body water (TBW) Total body water (TBW)
Advection of an air mass with a different ELR (environmental lapse rate). Advection of an air mass with a different ELR (environmental lapse rate).
The DNA from one chromosome has a mass of ~20 billion Daltons The DNA from one chromosome has a mass of ~20 billion Daltons
Married or partnered couples within a visible minority mixed group Married or partnered couples within a visible minority mixed group
Video: Sister chromatids of a metaphase chromosome animation

For a complete list of videos, visit our video library