« previous next »

Author Question: Describe the kind of observations that have led astronomers to believe that supermassive black holes ... (Read 40 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?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Four main models that describe the relationship between ecosystem function and biodiversity. Four main models that describe the relationship between ecosystem function and biodiversity.
The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star
A recruiting poster for the “True Sons of Freedom” encouraged African Americans to enlist. In fact, A recruiting poster for the “True Sons of Freedom” encouraged African Americans to enlist. In fact,
Muhammad Placing the Black Stone on His Cloak, from Rashid al-Din's Jami al-Tawarikh ... Muhammad Placing the Black Stone on His Cloak, from Rashid al-Din's Jami al-Tawarikh ...
Describe how fat is digested, absorbed, and transported in the body Describe how fat is digested, absorbed, and transported in the body
Mendel’s Observations for Seven Monohybrid Traits in the F1 and F2 Generations Mendel’s Observations for Seven Monohybrid Traits in the F1 and F2 Generations
Video: Skin Cancer

For a complete list of videos, visit our video library