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 39 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?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

The microchip is transforming our lives—the way we shop, spend our leisure, relate to one another, ... The microchip is transforming our lives—the way we shop, spend our leisure, relate to one another, ...
A ship is being pulled through a harbor at constant velocity by two tugboats as shown in the ... A ship is being pulled through a harbor at constant velocity by two tugboats as shown in the ...
A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ... A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ...
For a particular process that is carried out at constant pressure, q = 145 kJ and w = -35 kJ. ... For a particular process that is carried out at constant pressure, q = 145 kJ and w = -35 kJ. ...
At 34.5°C, oxygen gas expands from 34.5 L to 45.7 L against a constant pressure of 750 mmHg. ... At 34.5°C, oxygen gas expands from 34.5 L to 45.7 L against a constant pressure of 750 mmHg. ...
The charge for telephone calls T is partly constant and partly varies with the number N of ... The charge for telephone calls T is partly constant and partly varies with the number N of ...
Video: Introduction to Heart Attacks

For a complete list of videos, visit our video library