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

Author Question: Who first used RR Lyrae variable stars to determine distances in our Milky Way galaxy? a. ... (Read 86 times)

awywial

  • Hero Member
  • *****
  • Posts: 577
on: Jul 27, 2018
Who first used RR Lyrae variable stars to determine distances in our Milky Way galaxy?
 
  a. Henrietta Leavitt
  b. Edwin Hubble
  c. John Glenn
  d. Carl Sagan
  e. Harlow Shapley

Question 2

How does the luminosity depend on temperature for stars of the same size?
 
  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

xthemafja

  • Sr. Member
  • ****
  • Posts: 348
Reply #1 on: Jul 27, 2018
Answer to Question 1

e

Answer to Question 2

The relationship among luminosity, radius, and temperature tells us that luminosity is proportional to the surface area and to temperature to the fourth power. For stars of the same size (same surface area), L is proportional to T2.


awywial

  • Member
  • Posts: 577
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

31809pancho

  • Member
  • Posts: 317
Reply 3 on: Yesterday
Excellent

« previous next »
 

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.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

The asymmetrical appearance of Mira, an oscillating variable star. The asymmetrical appearance of Mira, an oscillating variable star.
The two bright stars are (left) Alpha Centauri and (right) Beta Centauri. The two bright stars are (left) Alpha Centauri and (right) Beta Centauri.
Using Parallax to Determine Distance Using Parallax to Determine Distance
Seyfert Galaxy NGC 1566 Seyfert Galaxy NGC 1566
Determine exact value of tan2x,sin2x, and cos2x Determine exact value of tan2x,sin2x, and cos2x
If P(θ) = (√3 /2, -1/ 2), determine the coordinates of P (θ + 90 °) using the unit circle If P(θ) = (√3 /2, -1/ 2), determine the coordinates of P (θ + 90 °) using the unit circle
Video: Cardiac conductile cells

For a complete list of videos, visit our video library