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

Author Question: Black holes are thought to be abundant, yet they are hard to find. Explain why. What will be an ... (Read 21 times)

MGLQZ

  • Hero Member
  • *****
  • Posts: 579
on: Jul 14, 2018
Black holes are thought to be abundant, yet they are hard to find. Explain why.
 
  What will be an ideal response?

Question 2

Compare the three main types of galaxies.
 
  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

amanda_14

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 14, 2018
Answer to Question 1

Black holes are gravitational vacuums, so much so that light cannot escape. Consequently, they are really difficult to see (hence, black hole). In order to look for them, we must look for hot matter emitting x-rays as it is being engulfed by a black hole. In and of itself, this means that we can only look for black holes that are not isolated, as we need to be able to detect whatever matter is near them as it is being sucked in in order to determine the location of a black hole.

Answer to Question 2

Spiral galaxies are flat, disk-shaped bodies with arms extending in a spiral out from the nucleus. Elliptical galaxies are spherical to rugby-ball shaped and include the biggest and smallest galaxies we have identified. Irregular galaxies are the least common, show no symmetry, and may be irregular due to gravitational distortion by a nearby massive body.


MGLQZ

  • Member
  • Posts: 579
Reply 2 on: Jul 14, 2018
Excellent

patma1981

  • Member
  • Posts: 292
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

Did you know?

Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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.

black and white face black and white face
black swallower black swallower
Black and white patients enrolled in Medicare do not receive the same medical treatment, even when ... Black and white patients enrolled in Medicare do not receive the same medical treatment, even when ...
How to find the anti-derivative of a function (Part 2) How to find the anti-derivative of a function (Part 2)
How to find the volume and surface area of any triangular prism How to find the volume and surface area of any triangular prism
Find derivative using product rule Find derivative using product rule
Video: Pressure Flow Model Animation

For a complete list of videos, visit our video library