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 259 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?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

Did you know?

Medication errors are three times higher among children and infants than with adults.

The formation of a chimeric gene that is found in people with certain forms of leukemia. The formation of a chimeric gene that is found in people with certain forms of leukemia.
Betelgeuse is a semiregular variable star Betelgeuse is a semiregular variable star
Balmer Lines in the Spectrum of a Star Balmer Lines in the Spectrum of a Star
Center of Mass of a Binary Star System Center of Mass of a Binary Star System
The Structure of an Old High-Mass Star The Structure of an Old High-Mass Star
Conditions Necessary for Hurricane Formation Conditions Necessary for Hurricane Formation
Video: ACTH/Cortisol (glycogenolysis, protein catabolism, lipolysis and gluconeogenesis)

For a complete list of videos, visit our video library