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 83 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
YES! Correct, THANKS for helping me on my review

raenoj

  • Member
  • Posts: 340
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
Total hip prosthesis. Total hip prosthesis.
During a total solar eclipse, the solar corona can be seen with the naked eye, during the brief peri During a total solar eclipse, the solar corona can be seen with the naked eye, during the brief peri
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Determine the enthalpy change of this reaction Determine the enthalpy change of this reaction
What mass of sulfur hexafluoride, SF6, has the same number of fluorine atoms as 25.0 g of ... What mass of sulfur hexafluoride, SF6, has the same number of fluorine atoms as 25.0 g of ...
Video: Oral Hygiene & Braces Animation

For a complete list of videos, visit our video library