This topic contains a solution. Click here to go to the answer

Author Question: What is the evidence to support the existence of a black hole at the center of the Milky Way? ... (Read 65 times)

geoffrey

  • Hero Member
  • *****
  • Posts: 880
What is the evidence to support the existence of a black hole at the center of the Milky Way?
 
  What will be an ideal response?

Question 2

Summarize the links in the distance chain that allow us to estimate distances to the farthest reaches of the universe.
 
  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

karmakat49

  • Sr. Member
  • ****
  • Posts: 369
Answer to Question 1

A large amount of activity is present. There is evidence of strong magnetic fields, X-ray sources, extremely high stellar densities, an extremely energetic accretion disk, the strongest source of radio waves in the sky, and the stars and gas speed up as you get close to the core.

Answer to Question 2

We can determine the distance to solar system objects through radar ranging. This gives us an accurate distance to the Sun so that we can use stellar parallax to measure the distances to the nearest stars. Since there is a period-luminosity relationship for Cepheids, we can measure the distances to other Cepheids by just measuring the time period between peaks of brightness. Cepheids are bright enough to be observed in galaxies other than the Milky Way. Therefore, they serve as a bridge between us and standard candles in other galaxies. Once we determine the distance to another galaxy for which we have observed a white-dwarf supernova, we then can calibrate the average luminosity of white-dwarf supernovae. White-dwarf supernovae and Cepheids get us far enough away from the Milky Way that we then can calibrate Hubble's law by determining the Hubble constant. Once we know the Hubble constant, we will be able to determine a galaxy's distance from its redshift.




geoffrey

  • Member
  • Posts: 880
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it


6ana001

  • Member
  • Posts: 311
Reply 3 on: Yesterday
Excellent

 

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

For a complete list of videos, visit our video library