« previous next »

Author Question: Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the ... (Read 37 times)

hbsimmons88

  • Hero Member
  • *****
  • Posts: 526
on: Jul 27, 2018
Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
 
  A) the average survival time of the civilizations
  B) the lack of metals for technology
  C) the speed of technological development
  D) the expansion of the universe
  E) the number of supernova explosions

Question 2

Contrast the appearance of the H-R diagrams of a young open and old globular cluster.
 
  What will be an ideal response?


jaykayy05

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

In a young cluster, the main sequence is well defined, particularly to the top left, but as these massive stars evolved rapidly, in an old globular the top left portion is missing, and evolved red giants now populate the top right portion of the diagram.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

hbsimmons88

  • Hero Member
  • *****
  • Posts: 526
Reply #2 on: Jul 27, 2018
Thank you!


jaykayy05

  • Sr. Member
  • ****
  • Posts: 329
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Mendel's analyses of single-factor crosses Mendel's analyses of single-factor crosses
Conditions for Eclipses Conditions for Eclipses
Thangka depicting Bhavacakra (Wheel of Life), Bhutan. Thangka depicting Bhavacakra (Wheel of Life), Bhutan.
Enterohepatic recirculation of a drug can increase its half-life in the body and prolong its ... Enterohepatic recirculation of a drug can increase its half-life in the body and prolong its ...
Various types of integumentary conditions.(B) Herpes simplex. Various types of integumentary conditions.(B) Herpes simplex.
Various types of integumentary conditions. (F) Dermatitis. Various types of integumentary conditions. (F) Dermatitis.
Video: Lactation and Breast Feeding

For a complete list of videos, visit our video library