« previous next »

Author Question: Approximately how many brown dwarfs are believed to exist in the Milky Way galaxy? A) 100,000 B) ... (Read 64 times)

jayhills49

  • Hero Member
  • *****
  • Posts: 559
on: Jul 27, 2018
Approximately how many brown dwarfs are believed to exist in the Milky Way galaxy?
 
  A) 100,000
  B) one million
  C) one billion
  D) one hundred billion
  E) ten trillion

Question 2

How does the cosmic background radiation relate to the Big Bang?
 
  What will be an ideal response?


macagnavarro

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

After the Big Bang the universe was filled with only radiation. It was a radiation dominated universe. After protons and neutrons formed the universe was opaque to radiation. Photons couldn't travel far without interacting with an electron. So nothing was visible. At the time of the decoupling, the universe become transparent to radiation and photons could travel with scattering off electrons except at very specific wavelengths. The artifact of this period of decoupling, when photons were first able to travel great distances, is the 3 K cosmic background radiation.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Did you know?

Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Spiral Galaxies Seen Nearly Edge On from the Milky Way Spiral Galaxies Seen Nearly Edge On from the Milky Way
Tooth development and eruption are commonly used to assess age in the subadult skeleton. Deciduous ( Tooth development and eruption are commonly used to assess age in the subadult skeleton. Deciduous (
Milky Way Milky Way
For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately
Video: Semidiscontinuous DNA replication

For a complete list of videos, visit our video library