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

Author Question: You see two main-sequence stars with the same spectral type. Star 1 is dimmer in apparent brightness ... (Read 41 times)

fagboi

  • Hero Member
  • *****
  • Posts: 535
on: Jul 27, 2018
You see two main-sequence stars with the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude, assuming there is no absorption of either star's light by interstellar gas or dust?
 
  A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other.
  B) The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2.
  C) Star 1 is 10 times more distant than Star 2.
  D) Star 1 is 100 times more distant than Star 2.
  E) Star 1 is 100 times nearer than Star 2.

Question 2

What is true of the Local Group?
 
  A) It contains about 2500 galaxies.
  B) The Andromeda galaxy is a satellite of the Milky Way.
  C) The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies.
  D) The giant ellipticals are the largest members.
  E) It consists of mostly spirals.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Bigfoot1984

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

C


fagboi

  • Member
  • Posts: 535
Reply 2 on: Jul 27, 2018
Gracias!

ryhom

  • Member
  • Posts: 366
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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
Classifying the Spectra of Stars Classifying the Spectra of Stars
A Mass-Loss Star A Mass-Loss Star
Effect of stimulus type on graded potentials. Effect of stimulus type on graded potentials.
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum
Main body cavities that hold human organs Main body cavities that hold human organs
Video: Predator- prey competition and symbiosis

For a complete list of videos, visit our video library