« previous next »

Author Question: Explain why observations suggest the presence of dark energy in the universe.? What will be an ... (Read 28 times)

iveyjurea

  • Hero Member
  • *****
  • Posts: 555
on: Jul 27, 2018
Explain why observations suggest the presence of dark energy in the universe.?
 
  What will be an ideal response?

Question 2

If a spaceship travels near the speed of light away from the Earth, an observer on Earth would see the length of the spaceship ________.
 
  Fill in the blank(s) with correct word


heyhey123

  • Sr. Member
  • ****
  • Posts: 353
Reply #1 on: Jul 27, 2018
Answer to Question 1

Observations show that the expansion rate of the universe was slower in the past than its current value. Gravity slows the expansion rate with time so the observed acceleration implies the existence of a new force or energy that h as not been recognized before.

Answer to Question 2

shrink


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

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

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Organisms can be classified according to their source of energy Organisms can be classified according to their source of energy
Mapping Dark Matter Mapping Dark Matter
Mixing alcohol with caffeinated energy drinks can have dangerous consequences Mixing alcohol with caffeinated energy drinks can have dangerous consequences
The mitochondrion is the center of energy transformation in the cell The mitochondrion is the center of energy transformation in the cell
Explain how it can be desirable from an intertemporal perspective for a country run a current ... Explain how it can be desirable from an intertemporal perspective for a country run a current ...
Dark Green Eye Color Dark Green Eye Color
Video: Brain Lobes Animation

For a complete list of videos, visit our video library