This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why do we believe there is dark matter? What will be an ideal ... (Read 35 times)

jasdeep_brar

  • Hero Member
  • *****
  • Posts: 569
on: Jul 27, 2018
Why do we believe there is dark matter?
 
  What will be an ideal response?

Question 2

What is thought to lie at the center of Jupiter?
 
  A) a hot sea of liquid metallic hydrogen
  B) gaseous hydrogen and helium, for Jupiter is not differentiated like Earth
  C) a fusion core like the Sun's, with hydrogen being turned into helium
  D) a solid core of crystalline helium
  E) a massive core of rocky materials with some iron mixed in


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

SeanoH09

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 27, 2018
Answer to Question 1

When we use the Keplerian equation to determine the mass of the Galaxy, we find a value of 100 billion Suns inside the Sun's orbital radius, or about 200 billion Suns all the way out to the end of the visible part of the spiral arms and halo stars. However, when we look the rotation curve, we find objects distant from the center rotating much faster than expected. To account for this, significantly more mass must exist outside the visible portion of our galaxy that we cannot see.

Answer to Question 2

E


jasdeep_brar

  • Member
  • Posts: 569
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

rachel

  • Member
  • Posts: 323
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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.

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

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.
The Hartlaub's Duck (Pteronetta hartlaubii) is a dark chestnut-coloured duck of African forests The Hartlaub's Duck (Pteronetta hartlaubii) is a dark chestnut-coloured duck of African forests
Dark Horse Dark Horse
Time Slows Down Near Matter Time Slows Down Near Matter
What are examples of ideal forms? What are examples of ideal forms?
A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ... A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ...
Video: B cells and antibodies

For a complete list of videos, visit our video library