« previous next »

Author Question: LMC X-3 is a binary system that is believed to contain a black hole. a. True b. False Indicate ... (Read 62 times)

abarnes

  • Hero Member
  • *****
  • Posts: 556
on: Jul 27, 2018
LMC X-3 is a binary system that is believed to contain a black hole.
 
  a. True
  b. False
  Indicate whether the statement is true or false

Question 2

What are some new techniques and technologies that enable construction of optical telescopes with very large mirrors?
 
  What will be an ideal response?


micaelaswann

  • Sr. Member
  • ****
  • Posts: 314
Reply #1 on: Jul 27, 2018
Answer to Question 1

True

Answer to Question 2

Constructing large-mirror optical telescopes with thin, or floppy, mirrors has made the process much more feasible. Thin mirrors are lightweight and so do not require massive support structures. Some large mirrors are cast in a rotating oven that causes the molten glass to flow to form a concave upper surface, so grinding and polishing the mirror is relatively fast. Mirrors can also be made of segments, which are economical because each segment can be made separately. For both floppy and segmented mirrors, active optics, computer-driven thrusters behind the mirrors, is used to control their optical shapes.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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.

A classification system for living and extinct organisms. A classification system for living and extinct organisms.
Endocrine system mind map Endocrine system mind map
CRISPR-Cas9 System for In Vivo Genome Editing Experiments CRISPR-Cas9 System for In Vivo Genome Editing Experiments
Nervous System Regulation of the Heart Nervous System Regulation of the Heart
Major muscles of the human musculoskeletal system Major muscles of the human musculoskeletal system
Some of the major nerves of the human nervous system Some of the major nerves of the human nervous system
Video: Primary Active Transport - electrochemical gradient and ion transport / water movement

For a complete list of videos, visit our video library