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

Author Question: How do we know that a hot main sequence star (and not some other kind of star) is embedded in a ... (Read 67 times)

ap345

  • Hero Member
  • *****
  • Posts: 537
on: Jul 27, 2018
How do we know that a hot main sequence star (and not some other kind of star) is embedded in a cloud of interstellar gas?
 
  What will be an ideal response?

Question 2

What are the similarities and differences between the Kelvin and Fahrenheit temperature scales? Identify the freezing point of water on both scales.
 
  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

Awesome

  • Sr. Member
  • ****
  • Posts: 280
Reply #1 on: Jul 27, 2018
Answer to Question 1

Except for white dwarfs, all hot stars are very luminous. The large amount of ultraviolet light produced by them will ionize any gas in their vicinity and produce an HII region. The visible light from the HII region's emission spectrum tells us of the presence of the gas.

Answer to Question 2

The Fahrenheit scale is an archaic scale that has no obvious starting point. The Kelvin scale was devised to begin at the lowest possible temperature in the universe. In Fahrenheit the freezing point of water is 32, in Kelvin it's 273.


ap345

  • Hero Member
  • *****
  • Posts: 537
Reply #2 on: Jul 27, 2018
TY


Awesome

  • Sr. Member
  • ****
  • Posts: 280
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Relationships among the coding sequence of a gene, the codon sequence of an mRNA, the anticodons of Relationships among the coding sequence of a gene, the codon sequence of an mRNA, the anticodons of
Proper Motion of Barnard’s Star Proper Motion of Barnard’s Star
Mass Loss from a Supermassive Star Mass Loss from a Supermassive Star
8.The following table contains DNA-sequence information compiled by Marilyn Kozak (1987). The ... 8.The following table contains DNA-sequence information compiled by Marilyn Kozak (1987). The ...
Main mechanism of carbon dioxide transport and exchange. A lesser amount of CO2 travels to the lungs Main mechanism of carbon dioxide transport and exchange. A lesser amount of CO2 travels to the lungs
Sea Star Body Plan Sea Star Body Plan
Video: Introduction to Sleep Apnea

For a complete list of videos, visit our video library