« previous next »

Author Question: Why are nearly all recently built astronomical telescopes reflectors instead of refractors? What ... (Read 116 times)

aabwk4

  • Hero Member
  • *****
  • Posts: 593
on: Jul 27, 2018
Why are nearly all recently built astronomical telescopes reflectors instead of refractors?
 
  What will be an ideal response?

Question 2

An M star is hotter than an O star.
 
  a. True
  b. False
  Indicate whether the statement is true or false


nekcihc358

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

Refracting telescopes suffer from chromatic aberration, which limits their usefulness, whereas reflecting telescopes do not have this problem. The primary lens of a refracting telescope is much more difficult to manufacture than a mirror of the same size, and are more expensive.

Answer to Question 2

False


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Reflecting Telescopes Reflecting Telescopes
A Recently Discovered Member of the Local Group A Recently Discovered Member of the Local Group
The recently discovered lleret calvaria from Kenya is the smallest H. erectus and shares many traits The recently discovered lleret calvaria from Kenya is the smallest H. erectus and shares many traits
A typical oil pan with a built-in windage tray used to keep oil from being churned up by the ... A typical oil pan with a built-in windage tray used to keep oil from being churned up by the ...
Jia's Fashions recently paid a $2 annual dividend. The company is projecting that its ... Jia's Fashions recently paid a $2 annual dividend. The company is projecting that its ...
Recently discovered members of the deep pelagic community Recently discovered members of the deep pelagic community
Video: Congenital Heart Defects Animation

For a complete list of videos, visit our video library