Top Posters
Since Sunday
w
5
a
3
j
2
a
2
t
2
u
2
r
2
j
2
j
2
l
2
d
2
y
2
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
hermiz hermiz
wrote...
Go to Answer
Posts: 569
Rep: 0 0
7 years ago
If the communication lifetime of civilizations in our galaxy is 100 million years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 1,300,000
B) 1 in 13
C) 1 in 1300
D) 1 in 130
Textbook 
Life in the Universe

Life in the Universe


Edition: 4th
Authors:
Read 76 times
1 Reply
Life in the Universe, 4/E (Bennett, Shostak)
Replies
Answer verified by a subject expert
DonskoyDonskoy
wrote...
#1
Top Poster
Posts: 582
Rep: 11 0
7 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

hermiz Author
wrote...

7 years ago
Thanks
Zacellison
wrote...

Yesterday
Thank you, thank you, thank you!
Shassta22
wrote...

2 hours ago
Thanks
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1280 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 2711
  
 106
  
 1097
Your Opinion
Which industry do you think artificial intelligence (AI) will impact the most?
Votes: 484
Previous poll results: Which of the following is the best resource to supplement your studies: