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

Author Question: Relate the age of the universe to the Hubble constant. What will be an ideal ... (Read 107 times)

james9437

  • Hero Member
  • *****
  • Posts: 568
on: Jul 27, 2018
Relate the age of the universe to the Hubble constant.
 
  What will be an ideal response?

Question 2

What advantage do radio astronomers have over optical ones in mapping the entire Milky Way?
 
  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

Bigfoot1984

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jul 27, 2018
Answer to Question 1

Inverting the Hubble constant and putting all distances in kilometers, gives us the age of the universe in seconds, assuming that Ho has never changed.

Answer to Question 2

Dust clouds block our view of all but the nearest spiral arms, but 21-cm radio waves can map the hydrogen gas in spiral arms all around the galaxy.


james9437

  • Hero Member
  • *****
  • Posts: 568
Reply #2 on: Jul 27, 2018
Thanks


Bigfoot1984

  • Sr. Member
  • ****
  • Posts: 321
Reply #3 on: Jul 27, 2018
Welcome :)


« previous next »
 

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

A 1998 false-colour near-infrared image of Uranus showing cloud bands, rings, and moons obtained by A 1998 false-colour near-infrared image of Uranus showing cloud bands, rings, and moons obtained by
The Speed of Light Is Constant The Speed of Light Is Constant
Observable Universe Before and After Inflation Observable Universe Before and After Inflation
The Number of Children Americans Think Are Ideal The Number of Children Americans Think Are Ideal
Relative Humidity Changes at Constant Water-Vapor Content Relative Humidity Changes at Constant Water-Vapor Content
For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately
Video: Semidiscontinuous DNA replication

For a complete list of videos, visit our video library