× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
k
1
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
Jkader Jkader
wrote...
Go to Answer
Posts: 498
Rep: 0 0
6 years ago
How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?
 
  a. Their nuclei are much brighter than expected.
  b. The orbits of stars near the center of the galactic nuclei are faster than expected.
  c. The luminosity of the nuclei varies over short times.
  d. The color of the nuclei is different than expected.

Question 2

Synchrotron radiation is produced
 
  a. in planetary nebulae.
  b. by red dwarfs.
  c. in massive stars as their iron core collapses.
  d. in supernova.
  e. by neutrinos.

Question 3

What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy?
 
  a. Normal spiral galaxies usually have shorter spiral arms.
  b. Normal spiral galaxies never contain a supermassive black hole at their center.
  c. The central region of a Seyfert galaxy is much brighter.
  d. Seyfert galaxies don't contain any star formation.
Read 54 times
3 Replies
Replies
Answer verified by a subject expert
wasgood27wasgood27
wrote...
#1
Posts: 345
Rep: 1 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

Jkader Author
wrote...
#2
6 years ago
Thanks for your help!!! Correct all the way through
wrote...
#3
6 years ago
You're welcome Slight Smile
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  878 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 3107
  
 62
  
 4645
Your Opinion
Who will win the 2024 president election?
Votes: 3
Closes: November 4
Previous poll results: Which industry do you think artificial intelligence (AI) will impact the most?