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

Author Question: Fusion in giant stars takes us all the way to iron before a Type II supernova occurs. Why did it ... (Read 41 times)

RYAN BANYAN

  • Hero Member
  • *****
  • Posts: 563
on: Jul 27, 2018
Fusion in giant stars takes us all the way to iron before a Type II supernova occurs. Why did it stop with helium in the far more energetic Big Bang?
 
  What will be an ideal response?

Question 2

Quasars are far more luminous than Type I supernovae; why not use them to calibrate Ho and the age of the universe?
 
  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

polinasid

  • Sr. Member
  • ****
  • Posts: 344
Reply #1 on: Jul 27, 2018
Answer to Question 1

The expansion of the Big Bang cooled the temperature to below 100 million K by the time the helium abundances could have allowed carbon production to start.

Answer to Question 2

Quasars vary over a period of weeks in brightness, and vary a great deal in luminosity from object to object. We need a uniform, consistent standard candle, and the run-away detonation of a 1.4 solar mass white dwarf in a Type I supernova gives us just the desired combination of luminosity and consistency.


RYAN BANYAN

  • Hero Member
  • *****
  • Posts: 563
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


polinasid

  • Sr. Member
  • ****
  • Posts: 344
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

This diagram shows a cross-section of a solar-type star. This diagram shows a cross-section of a solar-type star.
Growth hormone disorders. Illustration of a pituitary giant and a pituitary dwarf, both adults of ab Growth hormone disorders. Illustration of a pituitary giant and a pituitary dwarf, both adults of ab
iron iron
Plotting the Ages of Stars Plotting the Ages of Stars
Carbonyl groups reaction type Carbonyl groups reaction type
Video: Neurosynapse Animation

For a complete list of videos, visit our video library