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

Author Question: What is the water hole? Why is so promising to radio astronomers? What will be an ideal ... (Read 46 times)

DelorasTo

  • Hero Member
  • *****
  • Posts: 548
on: Jul 27, 2018
What is the water hole? Why is so promising to radio astronomers?
 
  What will be an ideal response?

Question 2

Why are type O, A, and M stars considered poor candidates to find a technological civilization?
 
  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

ryrychapman11

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 27, 2018
Answer to Question 1

The water hole is the region of the radio spectrum between 18 cm (natural wavelength of the hydroxyl, OH, molecule and 21 cm (natural wavelength of atomic hydrogen, H). Hydroxyl and hydrogen combine to form water, and the 18- to 21-cm region of the spectrum is relatively free of background noise. Thus it is believed that the so-called water hole is a natural band for communication between galactic civilizations.

Answer to Question 2

Considering the time it took life on Earth to arise, type O and A stars have too short a lifetime to give life a chance to evolve into higher forms. Type M stars are so cool that they have a very small habitable zone, thus reducing the likelihood a planet would be in the right position.


DelorasTo

  • Member
  • Posts: 548
Reply 2 on: Jul 27, 2018
Excellent

lkanara2

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Did you know?

Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Water in a can Water in a can
Water Loss Through Evaporation Water Loss Through Evaporation
Different bodies of water have contrasting physical properties Different bodies of water have contrasting physical properties
Stable oxygen isotopes in water Stable oxygen isotopes in water
Water resources Water resources
As a result of a hole in the graph, which of the following functions does not have an average ... As a result of a hole in the graph, which of the following functions does not have an average ...
Video: Cardiac Cycle (Part 1 of 4)

For a complete list of videos, visit our video library