« previous next »

Author Question: Describe the kind of observations that have led astronomers to believe that supermassive black holes ... (Read 65 times)

jake

  • Hero Member
  • *****
  • Posts: 538
on: Jul 27, 2018
Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.
 
  What will be an ideal response?

Question 2

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.
 
  a. True
  b. False
  Indicate whether the statement is true or false


jointhecircus

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jul 27, 2018
Answer to Question 1

Measurements show that the stars near the centers of most galaxies are orbiting very rapidly. To hold stars in such small, short-period orbits, the centers of galaxies must contain millions or even billions of solar masses in a very small region.

Answer to Question 2

True


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Pacific Black Duck at Austins Ferry, Tasmania, Australia Pacific Black Duck at Austins Ferry, Tasmania, Australia
This graphic illustrates the original systems model of politics advanced by David Easton. Politics This graphic illustrates the original systems model of politics advanced by David Easton. Politics
Black and White Out-Migration from Virginia and North and South Carolina, 1870–1940 (in thousands) Black and White Out-Migration from Virginia and North and South Carolina, 1870–1940 (in thousands)
Use dye specifically made for coolant when checking for leaks using a black light. Use dye specifically made for coolant when checking for leaks using a black light.
Black-Scholes Formula Black-Scholes Formula
Video: Ear Animation

For a complete list of videos, visit our video library