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 58 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

sultana.d

  • Member
  • Posts: 320
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

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?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Structure of the globular domain of human PrP in monomeric Structure of the globular domain of human PrP in monomeric
The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star
A Globular Cluster A Globular Cluster
Finding derivatives of Trig Functions - pt 5 Finding derivatives of Trig Functions - pt 5
Finding derivatives of Exponential functions - pt 2 Finding derivatives of Exponential functions - pt 2
finding the resultant force finding the resultant force
Video: Cellular slime mold life cycle Animation

For a complete list of videos, visit our video library