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

Author Question: Perhaps as much as 95 of the matter in superclusters is dark matter. Indicate whether the ... (Read 60 times)

Mimi

  • Hero Member
  • *****
  • Posts: 542
on: Jul 27, 2018
Perhaps as much as 95 of the matter in superclusters is dark matter.
 
  Indicate whether the statement is true or false

Question 2

Discuss several disadvantages of refractor versus reflector telescopes.
 
  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

Kingjoffery

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 27, 2018
Answer to Question 1

TRUE

Answer to Question 2

Refractors must use lenses, and thus all suffer from some chromatic aberration; mirrors reflect all wavelengths of light the same. Correcting for chromatic aberration means including more optical surfaces, requiring more work than any reflector design, which includes the secondary mirrors. Large refractor lenses must be supported by their edges, which means they will flex under their own weight. Mirrors can be built much larger, and supported from the back with no light blockage. Lenses require two precision surfaces; mirrors only need one. Thick lenses will absorb some light, which is not an issue for mirrors.


Mimi

  • Member
  • Posts: 542
Reply 2 on: Jul 27, 2018
:D TYSM

xoxo123

  • Member
  • Posts: 335
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Did you know?

Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

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.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Mapping Dark Matter Mapping Dark Matter
Dark-Circle Dark-Circle
Antigen (dark green and orange) and antibody (blue and green) binding forming a complex. Antigen (dark green and orange) and antibody (blue and green) binding forming a complex.
Dark bread is not necessarily whole-grain bread Dark bread is not necessarily whole-grain bread
Interstellar Matter Interstellar Matter
Dark Blue Eye Color Dark Blue Eye Color
Video: Dissociative Disorders (Part 3)

For a complete list of videos, visit our video library