« previous next »

Author Question: Explain why observations suggest the presence of dark energy in the universe.? What will be an ... (Read 78 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?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

The "Emu in the sky," a constellation defined by dark clouds rather than the stars. The "Emu in the sky," a constellation defined by dark clouds rather than the stars.
Gaussian surface in the presence of a dielectric Gaussian surface in the presence of a dielectric
Food webs show feeding relationships and energy flow Food webs show feeding relationships and energy flow
Wind energy Wind energy
The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010 The distribution of high-energy, nutritious biscuits was a lifeline in the first days after the 2010
Energy Use by Different Country Groups Energy Use by Different Country Groups
Video: Hormonal regulation of pregnancy - weeks 17 through 38

For a complete list of videos, visit our video library