This topic contains a solution. Click here to go to the answer

Author Question: Before the decoupling, A) deuterium produced electrons and positrons. B) protons and electrons ... (Read 115 times)

RRMR

  • Hero Member
  • *****
  • Posts: 557
Before the decoupling,
 
  A) deuterium produced electrons and positrons.
  B) protons and electrons combined to form atoms.
  C) the universe was opaque to radiation.
  D) there was more helium than hydrogen.
  E) the universe was transparent to radiation.

Question 2

Why don't stars less massive then type M exist?
 
  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

popopong

  • Sr. Member
  • ****
  • Posts: 307
Answer to Question 1

C

Answer to Question 2

A body less massive than a type M star (about 8 the Sun's mass) will not get hot enough by gravitational collapse to start fusing hydrogen into helium.




RRMR

  • Member
  • Posts: 557
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)


sultana.d

  • Member
  • Posts: 320
Reply 3 on: Yesterday
Excellent

 

Did you know?

Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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?

The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

Did you know?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

For a complete list of videos, visit our video library