Author Question: Over time, what is the net effect of the star-gas-star cycle in the Milky Way? A) The gas of the ... (Read 79 times)

tth

  • Hero Member
  • *****
  • Posts: 579
Over time, what is the net effect of the star-gas-star cycle in the Milky Way?
 
  A) The gas of the interstellar medium is continually depleted in elements heavier than helium.
  B) The temperature of the interstellar medium varies between the cool 10-50 degrees (Kelvin) required to form stars and the 2000-30,000 degree (Kelvin) temperatures of the outer layers of the stars that form. But over time, more and more of the interstellar medium remains cool.
  C) The total mass in the galaxy's interstellar medium is gradually increased, and the new gas is continually enriched in heavy elements.
  D) The total mass in the galaxy's interstellar medium is gradually reduced, and the remaining gas is continually enriched in heavy elements.
  E) There is no net effect to the cycle. Mass in the interstellar medium lost to star formation is exactly replaced by stellar winds and supernova explosions.

Question 2

Most lunar craters are volcanic in origin.
 
  Indicate whether the statement is true or false



tennis14576

  • Sr. Member
  • ****
  • Posts: 334
Answer to Question 1

D

Answer to Question 2

FALSE



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

Did you know?

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

For a complete list of videos, visit our video library