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 217 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?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

In 1844, Charles Goodyear obtained the first patent for a rubber condom.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Developmental steps in the formation of a plant embryo Developmental steps in the formation of a plant embryo
Spectral Line Motion in Binary Star Systems Spectral Line Motion in Binary Star Systems
Formation of sodium chloride ions. Formation of sodium chloride ions.
Formation of the Appalachians Formation of the Appalachians
Animated Ion formation Animated Ion formation
A sea star A sea star
Video: First Stage of Labor and Delivery Video

For a complete list of videos, visit our video library