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 23 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
Gracias!

xiazhe

  • Member
  • Posts: 331
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

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.

Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye
"Dark Matter" "Dark Matter"
Gray Matter Development over the Surface of the Cortex Gray Matter Development over the Surface of the Cortex
Areas of sclerosis (see arrows) in the white matter of a patient with MS. Areas of sclerosis (see arrows) in the white matter of a patient with MS.
Interactions of Light and Matter Interactions of Light and Matter
Interstellar Matter Interstellar Matter
Video: Virtual Enzyme Kinetics & Lineweaver Burk Plot

For a complete list of videos, visit our video library