Top Posters
Since Sunday
c
6
r
4
c
3
m
3
h
3
1
3
n
3
s
3
d
3
c
3
r
3
e
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
Using the technique of main-sequence fitting to determine the distance to a star cluster requires that ________.
A) we have telescopes powerful enough to allow us to identify the spectral types of main-sequence stars of many masses in the cluster
B) the cluster be near enough for us to measure the parallax of its stars
C) we use ultraviolet and X-ray telescopes
D) we have a well-calibrated period-luminosity relation for Cepheid variable stars
Read 288 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
Thank you sir
Smiling Face with Open Mouth
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1202 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 94
  
 152
  
 787
Your Opinion
Who's your favorite biologist?
Votes: 608
Previous poll results: What's your favorite coffee beverage?