« previous next »

Author Question: If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time ... (Read 41 times)

Bob-Dole

  • Hero Member
  • *****
  • Posts: 547
on: Jul 27, 2018
If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time of about 14 billion years.
 
  Indicate whether the statement is true or false

Question 2

Contrast the main mirrors of Newtonian and Cassegrain designs.
 
  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

Both use a curved mirror, but the Newtonian has a flat secondary mirror that sends the light to an eyepiece at the side of the telescope, while the Cassegrain mirror is similar, but usually more steeply curved, and needs a hole to be drilled in the center for access to the Cassegrain focus behind this mirror.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Bob-Dole

  • Hero Member
  • *****
  • Posts: 547
Reply #2 on: Jul 27, 2018
Thank you!


micaelaswann

  • Sr. Member
  • ****
  • Posts: 314
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
Bereaved spouses studied before loss, at the time of loss, and 18 months after loss show five ... Bereaved spouses studied before loss, at the time of loss, and 18 months after loss show five ...
A clock is showing the time as exactly 3:00 p.m. and 25 s. A clock is showing the time as exactly 3:00 p.m. and 25 s.
Mirror recognition and self-naming develop at almost exactly the same time Mirror recognition and self-naming develop at almost exactly the same time
Surtsey, a volcanic island, during the time of its formation. Surtsey, a volcanic island, during the time of its formation.
The Hfr chromosome time-of-entry map is assembled from the recombinant data The Hfr chromosome time-of-entry map is assembled from the recombinant data
Video: Asthma Treatment

For a complete list of videos, visit our video library