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

Author Question: Contrast the roles of dark matter and dark energy in the fate of the cosmos. What will be an ... (Read 182 times)

Lobcity

  • Hero Member
  • *****
  • Posts: 524
Contrast the roles of dark matter and dark energy in the fate of the cosmos.
 
  What will be an ideal response?

Question 2

How does gravitational lensing let us find massive dark objects?
 
  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

connor417

  • Sr. Member
  • ****
  • Posts: 329
Answer to Question 1

At first, the discovery of much dark matter seemed to increase the role of gravity, giving us more than the critical density and closing the Big Bang. But dark energy acts against gravity, speeding up the expansion into at least a flat universe in the future.

Answer to Question 2

When a black hole or brown dwarf passes between us and a bright star, the gravity of the dark object can bend and focus the light of the distant star, making it brighten temporarily. The more massive the unseen object, the longer this brightening will last.




Lobcity

  • Member
  • Posts: 524
Reply 2 on: Jul 27, 2018
Excellent


nanny

  • Member
  • Posts: 313
Reply 3 on: Yesterday
Gracias!

 

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

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

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

For a complete list of videos, visit our video library