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 45 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
:D TYSM

sultana.d

  • Member
  • Posts: 320
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Did you know?

Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

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.

A pteridophyte stem with tracheophyte adaptations for transporting and conserving water. A pteridophyte stem with tracheophyte adaptations for transporting and conserving water.
Effect of extracellular osmolarity on water movement across a plasma membrane Effect of extracellular osmolarity on water movement across a plasma membrane
A typical eye wash station. A thorough flushing of the eyes with water is the first and often the ... A typical eye wash station. A thorough flushing of the eyes with water is the first and often the ...
The movement of water vapor molecules exerts vapor pressure on surfaces. The movement of water vapor molecules exerts vapor pressure on surfaces.
Nutrients Are Transported through the Circulatory and Lymphatic Systems Water-soluble nutrients Nutrients Are Transported through the Circulatory and Lymphatic Systems Water-soluble nutrients
Amborella and Water Lily Amborella and Water Lily
Video: Oxygen transport - methods and oxyhemoglobin

For a complete list of videos, visit our video library