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 78 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
Thanks for the timely response, appreciate it

Perkypinki

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

A Total Eclipse of the Sun A Total Eclipse of the Sun
Flowchart to determine if a species is autotroph, heterotroph, or a subtype Flowchart to determine if a species is autotroph, heterotroph, or a subtype
A greater number of men than women hold full-time jobs, but the gap is closing because of an ... A greater number of men than women hold full-time jobs, but the gap is closing because of an ...
Determination of the number of theoretical stages Determination of the number of theoretical stages
Sunflower Sea Star, California. Sunflower Sea Star, California.
Number line (5 - 1) Number line (5 - 1)
Video: Anatomy and Chemical Makeup of a Single Hair (Animation)

For a complete list of videos, visit our video library