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

Author Question: Which is used observationally to determine the age of a star cluster? A) the total number of ... (Read 62 times)

CORALGRILL2014

  • Hero Member
  • *****
  • Posts: 525
on: Jul 27, 2018
Which is used observationally to determine the age of a star cluster?
 
  A) the total number of main-sequence stars
  B) the luminosity of the main-sequence turn-off point
  C) the amount of dust that lies around the cluster
  D) the number of white dwarfs
  E) the ratio of giants to supergiants

Question 2

Which of the following are the best candidates to search for planets that might harbor extraterrestrial life?
 
  A) low mass stars (less than one-tenth of the mass of the Sun), because these are the most common stars in our galaxy
  B) solar-mass stars, because they have both a large habitable zone and a long stellar lifetime.
  C) massive stars (greater than twice the mass of the Sun) because they provide more energy to promote biology
  D) halo stars, because planets can form in isolation from disruptive stellar encounters
  E) binary stars, because they provide twice as much energy to promote biology


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kaykay69

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


CORALGRILL2014

  • Member
  • Posts: 525
Reply 2 on: Jul 27, 2018
:D TYSM

bassamabas

  • Member
  • Posts: 294
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Total hip prosthesis. Total hip prosthesis.
When the number of miles traveled is considered, drivers under 25 years of age and those over 70 are ... When the number of miles traveled is considered, drivers under 25 years of age and those over 70 are ...
Immunofixation electrophoresis. (a) IgG kappa myeloma, (b) Controls showing total serum protein ... Immunofixation electrophoresis. (a) IgG kappa myeloma, (b) Controls showing total serum protein ...
Number of Mutations Associated with Specific Forms of Cancer Number of Mutations Associated with Specific Forms of Cancer
A company purchased 26 desks for $240 each and 18 chairs for $59 each. Compute the total ... A company purchased 26 desks for $240 each and 18 chairs for $59 each. Compute the total ...
Nitin earns $48,000 per year. Determine his gross earnings for each pay period if he is paid ... Nitin earns $48,000 per year. Determine his gross earnings for each pay period if he is paid ...
Video: Introduction to Genetics

For a complete list of videos, visit our video library