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

Author Question: Briefly describe how we can use the orbital characteristics of stars at many distances from the ... (Read 85 times)

captainjonesify

  • Hero Member
  • *****
  • Posts: 543
Briefly describe how we can use the orbital characteristics of stars at many distances from the galactic center to determine the distribution of mass in the Milky Way.
 
  What will be an ideal response?

Question 2

A loop of gas following the magnetic field lines between sunspots' poles is a
 
  A) prominence.
  B) coronal hole.
  C) coronal mass ejection.
  D) flare.
  E) ray.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

amandanbreshears

  • Sr. Member
  • ****
  • Posts: 320
Answer to Question 1

Using the orbital velocity law, related to Newton's version of Kepler's third law, we can determine the mass of the galaxy that lies within a particular orbit (and thus distance from the center) if we know the average orbital velocity of stars or clouds at that distance. Therefore, by applying the orbital velocity law to the orbits of stars at many distances from the galactic center, we can determine how much mass lies within each radius. We often use the 21-cm line from atomic hydrogen to measure velocities of gas clouds because light at radio wavelengths can penetrate the dust that would normally obscure our vision in other wavelengths. Thus, we can measure orbital velocities of gas clouds wherever the gas is located in the galaxy.

Answer to Question 2

A




captainjonesify

  • Member
  • Posts: 543
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)


covalentbond

  • Member
  • Posts: 336
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

For a complete list of videos, visit our video library