« previous next »

Author Question: The visible parts of galaxies contribute about one-tenth of the critical density of the universe. ... (Read 53 times)

jace

  • Hero Member
  • *****
  • Posts: 541
on: Jul 27, 2018
The visible parts of galaxies contribute about one-tenth of the critical density of the universe.
 
  Indicate whether the statement is true or false

Question 2

In M82, observations indicate that there are several bright sources close to the center of the galaxy. These might be
 
  A) supernovae.
  B) accretion disks of supermassive black holes, millions of times as massive as our sun.
  C) accretion disks of intermediate black holes, hundreds of times as massive as our sun.
  D) accretion disks of stellar mass black holes.
  E) red giants in the process of forming planetary nebulae.


Awesome

  • Sr. Member
  • ****
  • Posts: 280
Reply #1 on: Jul 27, 2018
Answer to Question 1

FALSE

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

The tenuous atmosphere of Mars, visible on the horizon in this low-orbit photo The tenuous atmosphere of Mars, visible on the horizon in this low-orbit photo
Hematoma. A hematoma around the right eye caused by an injury. A hematoma is the result of bleeding Hematoma. A hematoma around the right eye caused by an injury. A hematoma is the result of bleeding
cell parts cell parts
Parts of a muscle. Parts of a muscle.
Big Picture of the Evolution of the Universe Big Picture of the Evolution of the Universe
Cell Grown in 15N and 14 N: Graph of Relative DNA Concentration Vs. the Density Cell Grown in 15N and 14 N: Graph of Relative DNA Concentration Vs. the Density
Video: Protein Structure - Primary, Secondary, Tertiary and Quaternary

For a complete list of videos, visit our video library