× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
vietquocnguyen vietquocnguyen
wrote...
Go to Answer
Posts: 498
Rep: 0 0
6 years ago
The brilliant nuclei of Seyfert galaxies change brightness rapidly, in only a few hours or minutes, especially at _____.
 
  A) microwave wavelengths
  B) visible light wavelengths
  C) gamma ray wavelengths
  D) X-ray wavelengths

Question 2

Which of the following is true of Seyfert galaxies?
 
  A) They have inactive nuclei.
  B) They mostly contain dying stars.
  C) The spectra of their nuclei contain broad emission lines of highly ionized atoms.
  D) The velocities of gas clouds at their centers are much less than velocities at the center of normal galaxies.

Question 3

The major observational difference between a Seyfert galaxy and a normal spiral galaxy is that, unlike a normal spiral galaxy, a Seyfert galaxy:
 
  A) usually has shorter spiral arms.
  B) does not have a black hole at its center.
  C) has a small, highly luminous nucleus in its bulge.
  D) does not contain young stars in its spiral arms.

Question 4

The Local Group is slightly more than _____ in diameter.
 
  A) 1 Mpc
  B) 2 Mpc
  C) 3 Mpc
  D) 4 Mpc
Read 22 times
3 Replies
Replies
Answer verified by a subject expert
elieli
wrote...
#1
Posts: 334
Rep: 1 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

wrote...
#2
6 years ago
TY
eli
wrote...
#3
6 years ago
My pleasure
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1270 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 292
  
 648
  
 262
Your Opinion
What percentage of nature vs. nurture dictates human intelligence?
Votes: 431
Previous poll results: Which of the following is the best resource to supplement your studies: