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

Author Question: Why are there few quasars at low redshifts and at high redshifts but many at redshifts of about 2? ... (Read 49 times)

panfilo

  • Hero Member
  • *****
  • Posts: 572
on: Jul 27, 2018
Why are there few quasars at low redshifts and at high redshifts but many at redshifts of about 2?
 
  What will be an ideal response?

Question 2

Planetary nebulae are sites of planet formation.
 
  a. True
  b. False
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

karmakat49

  • Sr. Member
  • ****
  • Posts: 369
Reply #1 on: Jul 27, 2018
Answer to Question 1

Quasars are most common with redshifts over 2 and less common with redshifts above 3 . The largest quasar redshifts are over 6, but such high-redshift quasars are rare. Evidently astronomers see few quasars at high redshifts because they are looking back to an age when the Universe was so young it had not yet formed many galaxies. At redshifts between 2 and 3, galaxies were actively growing and colliding, and quasars were about 1000 times more common than they are now.

Answer to Question 2

False


panfilo

  • Member
  • Posts: 572
Reply 2 on: Jul 27, 2018
:D TYSM

abro1885

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Modern primate study sometimes involves high-tech methods. This golden lion tamarin is having a batt Modern primate study sometimes involves high-tech methods. This golden lion tamarin is having a batt
Over the past four decades, the self-reported health of married men and women has remained high, ... Over the past four decades, the self-reported health of married men and women has remained high, ...
Ten Leading Causes of Death in High-Income Countries, 2008 Ten Leading Causes of Death in High-Income Countries, 2008
The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010 The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010
Nursing Care Plan Process: Client with High Blood Lipid Levels Nursing Care Plan Process: Client with High Blood Lipid Levels
During a period of high power demand, the voltage output of the power company is reduced by ... During a period of high power demand, the voltage output of the power company is reduced by ...
Video: Introduction to Pre-eclampsia

For a complete list of videos, visit our video library