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

Author Question: Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very ... (Read 55 times)

JMatthes

  • Hero Member
  • *****
  • Posts: 578
on: Jul 27, 2018
Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities.
 
  a. I & III
  b. I & IV
  c. II & III
  d. II & IV
  e. I, III, & IV

Question 2

What measurements are needed to determine the orbital motion of a spectroscopic binary star?
 
  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

reversalruiz

  • Sr. Member
  • ****
  • Posts: 327
Reply #1 on: Jul 27, 2018
Answer to Question 1

c

Answer to Question 2

Measure the spectra of the binary system over time and determine the Doppler shifts of the spectral lines from each star.


JMatthes

  • Member
  • Posts: 578
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

steff9894

  • Member
  • Posts: 337
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Young gorilla in tree Young gorilla in tree
This young boy with muscular dystrophy needs to receive tube feedings and home nursing care. He atte This young boy with muscular dystrophy needs to receive tube feedings and home nursing care. He atte
Barred Spiral Galaxies Barred Spiral Galaxies
The Rotation Curves of Four Spiral Galaxies The Rotation Curves of Four Spiral Galaxies
A typical good oxygen sensor waveform as displayed on a digital storage oscilloscope. Look for ... A typical good oxygen sensor waveform as displayed on a digital storage oscilloscope. Look for ...
Nuts are also a good source of B group vitamins (including folate), and vitamin E Nuts are also a good source of B group vitamins (including folate), and vitamin E
Video: Sigmoidoscopy

For a complete list of videos, visit our video library