Top Posters
Since Sunday
c
6
r
4
c
3
m
3
h
3
1
3
n
3
s
3
d
3
c
3
a
3
r
3
Home Q & A Board Science-Related Homework Help Physics
New Topic  
killian killian
wrote...
Go to Answer
Silver Member
Posts: 6024
Rep: 33 0
10 years ago
What is a Cepheid variable?
A) A type of very luminous star that makes an excellent standard candle
B) A bright source of variable X-ray emission, thought to harbor a supermassive black hole
C) A main-sequence star of spectral type B5
D) A type of galaxy that varies in its light output
Read 510 times
2 Replies
Smiling Face with Open Mouth
Replies
Answer accepted by topic starter
padrepadre
wrote...
#1
Staff Member
Educator
Top Poster
Posts: 21610
Rep: 4541 17
10 years ago
Sign in or Sign up in seconds to unlock everything for free
1
Mastering in Nutritional Biology
Tralalalala Slight Smile

Related Topics

killian Author
wrote...
#2
Silver Member
10 years ago
Thx man
Smiling Face with Open Mouth
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1185 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 4490
  
 400
  
 281