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

Author Question: Why has star formation ceased in the galactic halo? A) The halo has no gas at all. B) There are ... (Read 273 times)

big1devin

  • Hero Member
  • *****
  • Posts: 583
on: Jul 27, 2018
Why has star formation ceased in the galactic halo?
 
  A) The halo has no gas at all.
  B) There are no white dwarf binaries to trigger star formation via their supernovae.
  C) All the halo gas consists of elements with more protons than helium.
  D) All of the galaxy's cool gas settled to the galactic plane long ago.

Question 2

How are elements heavier than iron made? Why are they rare?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

honnalora

  • Sr. Member
  • ****
  • Posts: 325
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

The elements heavier than iron are formed when protons and neutrons are crammed into nuclei making up the outer layers of massive stars as those layers are hurled into the interstellar medium during a supernova event. These conditions do not last long, so there is very little time for the creation of these elements.


big1devin

  • Hero Member
  • *****
  • Posts: 583
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


honnalora

  • Sr. Member
  • ****
  • Posts: 325
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

Thyroid conditions may make getting pregnant impossible.

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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.

Formation of an oil deposit Formation of an oil deposit
Formation of disease-causing amyloid fibrils Formation of disease-causing amyloid fibrils
The Structure of an Old Low-Mass Star The Structure of an Old Low-Mass Star
Eye formation on the antenna Eye formation on the antenna
Mottled Sea Star (Evasterias troschelii) eating a clam, Alaska. Mottled Sea Star (Evasterias troschelii) eating a clam, Alaska.
A sea star A sea star
Video: Hormonal feedback loop components

For a complete list of videos, visit our video library