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

Author Question: The key to finding quasars' distances was A) planetary nebula in M51. B) globular clusters in ... (Read 65 times)

sheilaspns

  • Hero Member
  • *****
  • Posts: 567
on: Jul 27, 2018
The key to finding quasars' distances was
 
  A) planetary nebula in M51.
  B) globular clusters in the halo of M87 in Virgo.
  C) a Type I supernova in the spiral arm of 3C87.
  D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation.
  E) the huge redshifts of the hydrogen lines in 3C273.

Question 2

Define shepherd moons and give an example of them at work.
 
  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

kaykay69

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 27, 2018
Answer to Question 1

E

Answer to Question 2

The two small moons on each side of Saturn's F ring herd the particles into this narrow, twisted ring.


sheilaspns

  • Member
  • Posts: 567
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

nyrave

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Some Shapes of Planetary Nebulae Some Shapes of Planetary Nebulae
Three-dimensional structures of proteins: Globular protein Three-dimensional structures of proteins: Globular protein
Structures of iron–sulfur clusters Structures of iron–sulfur clusters
Finding derivatives of Trig Functions - pt 2 Finding derivatives of Trig Functions - pt 2
finding resultant for the following force combinations finding resultant for the following force combinations
Venn diagram representation of 17,067 medium and large clusters of protein Venn diagram representation of 17,067 medium and large clusters of protein
Video: hGH, Thyroid hormones & Aldosterone

For a complete list of videos, visit our video library