This topic contains a solution. Click here to go to the answer

Author Question: Explain how Edwin Hubble used Cepheid variables to change our view of the structure of the universe. ... (Read 130 times)

cnetterville

  • Hero Member
  • *****
  • Posts: 547
Explain how Edwin Hubble used Cepheid variables to change our view of the structure of the universe.
 
  What will be an ideal response?

Question 2

How does the Sun compare in size and brightness to other main-sequence stars?
 
  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

jxjsniuniu

  • Sr. Member
  • ****
  • Posts: 343
Answer to Question 1

Cepheid variables are extremely bright variable stars that increase and decrease in brightness in a repetitive cycle. This group of stars is significant because their true brightness, called absolute magnitude, can be determined by knowing the rate at which they pulsate. When the absolute magnitude of a star is compared to its observed brightness, a reliable approximation of distance can be established. Thus, Cepheid variables are important because they can be used to measure large astronomical distances. Hubble observed the Andromeda galaxy, beyond the Milky Way, and used his observations to determine that the universe extended far beyond the limits of our imagination.

Answer to Question 2

It is a medium-sized, middle-of-the-road main sequence star.




cnetterville

  • Member
  • Posts: 547
Reply 2 on: Jul 14, 2018
Wow, this really help


Animal_Goddess

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

Did you know?

Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

For a complete list of videos, visit our video library