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 13 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?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Spider's main organs Spider's main organs
Amino acid sequence of bovine insulin Amino acid sequence of bovine insulin
A Star with Three Planets A Star with Three Planets
A BLAST alignment between human myoglobin and human a-globin showing a 25% sequence identity A BLAST alignment between human myoglobin and human a-globin showing a 25% sequence identity
DNA sequence variation in parts of the Drosophila Adh gene DNA sequence variation in parts of the Drosophila Adh gene
A sea star A sea star
Video: Magnetic resonance imaging (MRI)

For a complete list of videos, visit our video library